Warranty vs Guarantee

I would say there is a difference: guarantee: "a formal assurance that certain conditions will be fulfilled, especially that a product will be of a specified quality" warranty: "a written guarantee promising to repair or replace an article if necessary within a specified period." ... A warranty is a type of guarantee; in the case of a product guarantee/product warranty, it's basically the same thing - the company undertakes to repair or replace your goods if they go wrong. Guarantee can also be used to express: "I promise, this plane will fly." "I guarantee you, this plane will fly."

http://english.stackexchange.com/questions/35788/warranty-vs-guarantee

What times are you open? vs What time do you open?

 I presume this is a difference between American and Irish English, but if I said "What time are you open on Saturday?" I would mean "At what time do you open on Saturday?" If I wanted to know the space of time, I would have to say "What times are you open on Saturday?" We would hardly ever leave out the on from "on Saturday".

https://forum.wordreference.com/threads/what-time-are-you-do-you-open-on-saturday.1328945/

Don't ever vs Never

I don't ever go / I never go

Either sentence is acceptable. However, be aware that the different forms "don't ever" and "never" usually have slightly different connotations. When spoken without emphasis, "never" is a simple statement of fact. To say "I never take the bus," says nothing about why you don't - it might well be that you just like to walk and the distance is short, for instance. To say "I don't ever take the bus", since you have chosen a more cumbersome phrase, suggests that you specifically avoid taking the bus, and that there is some strong motivation on your part for doing so.

Similarly, when using the phrases as part of a prohibition, "Don't (you) ever say that," is a stronger command than "Never say that," and the first suggests that if you do "say that" then the speaker will be personally upset with you.

At least, that's the AmE way I've always heard it used.

http://ell.stackexchange.com/questions/61610/i-dont-ever-go-i-never-go

Could you tell me the difference between come in and come on in?

There is no difference in meaning. I think "come in" is the most common. "Come on in" may be used more often if the people have been talking outside. It is slightly more relaxed and friendly.

Alternative ways of saying the same thing are "come inside" and "step inside"

I hope this helps.

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"Come in!" is more formal than "Come on in!", and doesn't have the same degree of enthusiasm and pleasure.

"Come in" is what I'd say to somebody I didn't know or like. "Come on in!" is what I'd say to somebody I really cared about, like a close friend or family member.

https://forum.wordreference.com/threads/come-in-come-on-in.320877/

The kettle is boiling? or The water is boiling?

When a kettle of water is boiling, do native speakers say?

The kettle is boiling.

The water in the kettle is boiling. OR

The water is boiling.

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In my family, it would always be "Kettle's boiling - it's your turn to make tea."

All your sentences are correct, but I think "The water is boiling" is not very common, and "The water in the kettle is boiling." is so unlikely as to be non-existent. It's just too long.
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Until it is actually boiling you could say 'the kettle’s on the boil'.

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Interesting, either a kettle or a jug.

Any of your sentences would be appropriate, the jug/kettle has boiled.

http://forum.thefreedictionary.com/postst36195_The-kettle---water-is-boiling-.aspx

This evening vs Tonight

I think different people use the words in different ways.

I'd say this evening for between about 5 pm to 9 pm today. And tonight from about 9 pm today to midnight, or perhaps a few hours into the morning.

A certain amount depends on context, and on the shared habits of the people speaking.

Something like a lecture or a film that starts at 7 o'clock could equally be described as both. But 'tonight' can apply to the whole night (until the next morning), so only this is appropriate for events at midnight or 1 a.m.

https://forum.wordreference.com/threads/tonight-this-evening.1969069/

Look out / Watch out and Be careful

Generally speaking, I would use "Look out!" to warn someone of danger that seems imminent. 

I would be more likely to use "Be careful" to warn someone of potential/possible danger.

We could also say 'Watch out!'

'Look out' and 'watch out' call attention to immediate danger. 'Be careful' is more general and can apply to daily tasks. For example, a jeweler must be careful in his daily tasks. A good chef must be careful in measuring the ingredients. A pilot must always be careful.

Credit: http://thegrammarexchange.infopop.cc/eve/forums/a/tpc/f/340600179/m/783100182/xsl/print_topic

May I follow/see/lift/walk you home?

May I follow you home? This may mean that you've never visited their home and wish to follow them in order to know where it is.

May I see you home? It may mean that you want to be absolutely sure that they make it to their house.

May I lift you home? It is used when someone who has a car offers a ride to someone who doesn't have a car. 

May I walk you home? It is used when, say, a friend, accompanies someone to their home. It is often used by people who are dating. The guy may wish to accompany his partner home. Or vise versa.

https://forum.wordreference.com/threads/may-i-you-home.291416/

Arrive home vs. Get home vs. Come home

He arrived home at 6:00.
He came home at 6:00.
He got home at 6:00.
What is the difference betwen them?

To me your three sentences have the same basic meaning, however "He came home at 6:00." has a more definite sense that the speaker was also there (at home) when "he" arrived. In other words, the perspective is slightly different.

Your other two sentences could be used more easily by someone who is reporting the time "he" arrived, but wasn't actually there to witness "his" arrival.

http://www.english-test.net/forum/ftopic16137.html

The difference between words: popular and common

Many of my students mix up the words “popular” and “common”.  The difference between them is very important for effective communication. The word “popular” is used to describe things or people that many people like, but “common” is used to describe things that happen a lot. When something is common, maybe people like it, but maybe they don’t. For example:

Johnny Depp is one of the most popular actors in Hollywood right now.

Going to look at cherry blossoms in April is extremely popular in Japan.

Toy race cars are very popular with young boys, but they’re not so popular with young girls.

Working overtime is very common in Japan.

When Japanese people travel, it’s common for them to buy many souvenirs for their family and friends.

Heart problems are common among people who are 65 years old or over.

It’s important that you don’t confuse these two words. If you say something like heart problems is popular, it will sound very strange because that would mean that many people like to have heart problems which is obviously not true.

https://englishhelponline.me/2010/07/05/the-difference-between-words-popular-and-common/

How long will you stay? vs How long will you be staying?

A question from Ben in Germany: 
Hi, my name is Ben, I'm from Germany, I live in Rostock. My question is what is the difference between "How long will you be staying in London?" and "How long will you stay in London?" What's the difference? 

Callum Robertson answers: 
This is quite a difficult question to answer. First off, I should say that if you used either of these forms you would be understood without difficulty and they are both asking for the same information. The answer would be a period of time, three weeks, 10 minutes, a couple of years, for example. 

But which is the most natural, which are you likely to hear? Well first let's look at the different forms. How long will you stay in London? This is what's commonly called the 'future simple'. How long will you be staying in London is the 'future continuous', also called the 'future progressive'. 

To understand the difference, I think it might be useful to look at an example showing the differences between a present simple and continuous. 

Nowadays, these days or today?

from English Grammar Today

We can use nowadays, these days or today as adverbs meaning ‘at the present time, in comparison with the past’:

I don’t watch TV very much nowadays. There’s so much rubbish on. It’s not like it used to be.

Young people nowadays don’t respect their teachers any more.

Warning:

Take care to spell nowadays correctly: not ‘nowdays’.

These days is more informal:

These days you never see a young person give up their seat for an older person on the bus. That’s what I was taught to do when I was a kid.

Pop singers these days don’t seem to last more than a couple of months, then you never hear of them again.

Why do you say 'a one-way ticket' and not 'an one-way ticket'?

When to use "a" or "an"... this is one of the more complicated things in English grammar. 

A banana, a house, a penguin... 

An apple, an igloo, an elephant... 

The basic rule is, we use "an" instead of "a", to seperate vowels. We don't say "a elephant", we say "an elephant", to seperate the a from the e. 

HOWEVER... 

so then why wouldn't we say "an one way ticket"? Well... we only seperate vowels in a phonetic sense... phonetic, as in, what the word sounds like, rather than how it is spelled. 

"one way ticket" may start with the vowel O... but it it sounds like "Wun way ticket"... a "W" sound... 

We don't say "a ostrich"... we say "an ostrich"... because the O in "ostrich" is pronounced as a vowel... but the O in "one" is pronounced as the consonant "w". 

Make sense? No, of course it doesn't, English is just ridiculous sometimes. 

Technically, we are also (sometimes) supposed to use "an" instead of "a" before a "h", even though h is not a vowel. As in, "it would be an honor..." We don't say "an house", we say "a house". When it is a silent "h", we are supposed to use "an"... 

I'm so glad I grew up with this language, because I'd hate to have to learn it at school...

https://answers.yahoo.com/question/index?qid=20140815053933AALXVQh

Catch the bus vs Take the bus

Catching a bus describes the process of getting to a stop/station, waiting and boarding.

Taking a bus describes the entire process, including the journey itself.

Much of the time, the distinction isn't important. For example:

"How did you get to work today?"

"I caught a bus." (The listener infers that having caught the bus, you stay on it)

"I took the bus." (You have described the journey)

However, it could be relevant:

"I read a book while I was taking the bus" (yes: reading while the bus is moving)

"I read a book while I was catching the bus" (unlikely: reading while stepping onto the bus, paying the driver, etc.)

It is a similar meaning to catch as catching a fish, or catching a ball. You and the bus are apart, and then you bring yourself into contact with it through your own effort. If you try to catch a bus, and fail, you miss it.

One other thing, you catch a bus at a specific place:

"You can catch the bus to Coventry on Smith Street"

But you take the bus from a place:

"You can take the bus to Coventry from Smith Street"

 http://english.stackexchange.com/questions/53764/catch-vs-take-a-bus-train

2-hour break vs 2 hours of breaks

If she wants one break lasting two hours, I would say:
Her mother allowed her a two-hour break a day.

If she could have breaks totalling two hours, I'd say:
Her mother allowed her two hours of breaks a day.

Find vs Look for

No, "look for" and "find" do NOT both mean searching. 

In the post you quoted, the person made it clear, I thought. 

"Searching" and "looking for" are ongoing activities. You look or search until that single moment when you find it. The act of finding is instantaneous, so it cannot have a progressive form. 

Lets say you throw a stone off a very tall cliff. The stone falls for a long time and then it hits the ground. There are many seconds when you can say it's falling but only on moment when it's hitting. While it falls, you don't say "the stone is hitting the ground." It fell for a long time then hit the ground. It's the same with looking for and finding. You look for a time and then hopefully in an instant you find it.

Unlike the stone that must eventually hit the ground, however, there is no guarantee that something lost will be found. Thats why you can ask someone to look, but only ask that they TRY to help you find. It might never be found.

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You will hear utterances such as "Can you find it for me?" Natural responses could, "I'll try", "Well, I'll look", or "I don't know yet".

The message behind the words may well be, "I want you to look for it and, I hope, find it", this does not mean that 'look for' and 'find' mean the same thing. I think that Barb has made the difference very clear; I just wanted to add the note on that question.

https://www.usingenglish.com/forum/threads/174305-find-vs-look-for/page2

Hobby vs Interest

Hobby is something you practice or do regularly. Theoretically, it takes 21 days to form a hobby ( even if you dislike the action)

Interest is something that you have a liking for and you may or may not do it. You can get interested into something in a second. 

My hobby is swimming. 

I am very much interested in skydiving. But have never done it. 

Turn your interests into hobbies

Draw vs Paint

Sketching: Before a complete drawing we draw the sketch of the drawing, and we work freehand, meaning that we draw the multiple-cross lines and it lacks the details that a complete drawing may have. Pencils, ink, and charcoal can be the medium through which sketching is done. Sketching is done on low quality papers like newsprint, etc. Drawing: Drawing means full art drawn using colored pencils, markers, graphite pencils, or pens to create a full picture by drawing single-pass lines that looks more neat and clean than free hand sketching. Drawing is done on high quality papers like drawing paper, Bristol paper, etc. Painting: In painting, multiple layers of colors are placed on each other (first background, then first layer of paint, then second, and so on) by use of brush and water- or oil-based paint. A painting may look complete after finishing it but some paintings don’t seem too complete until the end of the process. ..................... Drawing is dry (e.g. using a pencil or pen), painting needs paint and a brush http://ell.stackexchange.com/questions/7533/paint-vs-draw-difference-in-meaning