'Really into' and 'crazy about' mean you like something or love something very much.

For example : My son is really into soccer. He is crazy about Shimizu S-pulse.

When you want to ask someone the time the most popular way is
Do you have the time?
You can also ask
What time is it?
Do you have time? means Are you free?
Tell me the time. is an order (命令) and is rude (失礼).

The idiom 'to give one's all' means to try one's hardest. (張り切って頑張る)
For example :
She gave her all in the marathon.
We gave our all to make the sports day a success.

We say "wait for" when we are explaining what we are waiting for.
For example :
I waited for the bus.

We also use "for" to explain how long we waited
For example : I waited for the bus for 30 minutes.

To make a reservation at a restaurant we use the phrase
"book a table for (何人)".

For example : I'd like to book a table for two please.

If we go to a restaurant but we don't have a reservation, we can say
"A table for two please."
The waiter will then take us to a free table.

When we explain which day something happens, we use the word 'on'.

For example : I have a holiday on Sunday.

If we want to explain the time something happens, we use 'at'.

For example : School starts at 8 o'clock.

When we explain which month or year something happens, we use the word 'in'.

For example : I was born in 1971.

For example : Christmas is in December .

When we order food or drinks at a restaurant or cafe, the word 'have' is very useful.

For example : I'll have a hamburger please.

When you order food or drinks, you should always say please.
When the food is brought to you you should say thank you.

For example :
Waiter : What can I get you?
Customer : I'll have a cheese pineapple juice and a cheeseburger please.
Waiter : Sure. Would you like a small or large pineapple juice?
Customer : Small please.
Waiter : Coming right up. ...............Here's your cheeseburger and the pineapple juice.
Customer : Thank you.

When we go shopping the verb 'look for' (探す) is very useful.

For example : I'm looking for a t-shirt.

When you want to buy something for a friend, you should always say I'm looking for _____ for my friend.

For example :
Staff : Can I help you?
Customer : I'm looking for macadamia nut chocolates for my family.
Staff : Sure. They are over here. We have packs of 6 chocolates or 24 chocolates.
Customer : I'll take the 24 pack please.
Staff : Thank you. That's $6.99

When somebody says 'Happy New Year', 'Merry Christmas' or 'Have a nice day', it is polite to return the greeting.
The easiest way is to say You too !

If you are feeling sick, then a useful idiom is under the weather.

For example :
A: How is Mary?
B: She is under the weather.
A: Oh no! I hope she gets well soon.

Another idiom that has a similar meaning is off color.
This because when people are sick the color of their face changes.

For example :
A: How are you?
B: I'm feeling off color.
A: Oh no! I hope you get well soon.

When we talk about how long an event happens a useful word is over.

For example :
The Tokyo Olympics took place over two and a half weeks in the summer of 2020.

Over is usually used with the verbs (動詞) 'take place' or 'hold'

For other verbs for is more common.

For example :
The students traveled to Hawaii for five days for their school trip.

The words be able to mean the same as can.

For example :
I am able to swim.
My son is able to play soccer.
I am not able to play volleyball.

When we talk in the past tense (過去形) we should use was or were.

For example :
Mary was able to pass her high school entrance exams.
The students were able to finish the school marathon.

The phrase This is between you and mean means 'This is a secret. Don't tell anybody!'

When we use the verb (動詞) enjoy, it must be followed by a noun (名詞) or gerund (動名詞).

For example :
I enjoyed Disneyland.
I enjoyed playing tennis.

The verb to have fun means about the same as enjoy.

For example :
I had fun swimming.
I had fun at Disneyland.

When we talk about the future (将来/未来), we can use the phrase in the future.

For example :
I will go to university in the future.
I hope to visit Hawaii in the future.
Many people will travel to the moon in the future.

If we want to talk about the past (過去), the phrase in the past is very useful.
For example :

People didn't have smartphones in the past.

When we talk about our hobbies or things we are interested in, we can use the phrase be interested in ____.

For example :
I am interested in reading.
I am not interested in sport.
Many students are interested in TV games.

Sometimes people use the phrase be into when they talk about their interests.
For example :

My son is into soccer.
This means he is very interested in soccer.

When we talk about enjoyable plans, the phrase be looking forward to ____ is very useful.

For example :

I am looking forward to the holidays.
My son is looking forward to relaxing at home.

If something is not enjoyable we often use not looking forward to

The students are not looking forward to doing their homework.

If a person is capable (有能な) or clever and concentrating hard, we can say 'She is on the ball'.(注意を怠らず)

For example :
My son was watching YouTube all night. This morning he wasn't on the ball.

Over means about the same as more than (以上).

For example :
Taisei was founded over 100 years ago.
Most professional basketball players are over 1.90 meters tall.

The opposite of over is under. It means less than (以下).

For example :
The Taisei High School building was built under 25 years ago.

Now, in many foreign countries, most adults do not carry cash when they go shopping. They usually pay by credit card or debit card everywhere they go, even at convenience stores.

When you want to pay by credit card at a shop, there are some popular ways to ask.

Do you take credit card?
Do you accept credit card?

Can I pay by credit card?
Can I use credit card?