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Will robot butlers do all household chores by 2040?

-> Will 

I regret Nam isn't here now

-> I wish

They came to class late because of the heavy rain.

-> It rained

John forgot his umbrella, so he got wet

-> Because of

Go to Hanoi capital, and you will have a lot of fun.

-> If

I stayed at home because of feeling tired.

-> I felt

The last time we drank champagne was five months ago.

-> We haven't

Nga is sick today, so she can't go to school

-> Because

1) The last time we drank chamgpage was five months ago.

-> We haven't

2) I stayed at home because of feeling tired.

-> I felt

3) Go to Hanoi capital, and you will have a lot of fun.

-> If

4) John forgot his umbrella, so he got wet.

-> Because of

5) They came to class late because of the heavy rain.

-> It rained