I.

1.They invited him to go to the stadium the following day.

2.They asked him if he liked to play that game.

3.I was having lunch when my boyfriend rang.

4.If you eat breakfast, you won't get hungry during the class.

5.If I had enough apples, I would bake an apple pie this afternoon.

II.

1.I bought a new typewriter which costs me a lot of money.

2.Since it was raining, we have decided to postpone our camping.

3.However tired she is, my sister has to cook dinner for the family.

4.Ba misses the Math test yesterday, therefore, he will have to do it next week.

5.Her mother took her to the zoo and showed her some rare animals.

`1`. They asked him, "Shall we go to the stadium tomorrow?"

They invited him to go to the stadium the next day. (invite sb to V: mời ai làm gì)

`2`. They asked him, "Do you like to play this game?"

They asked him if he liked to play that game. (câu tường thuật dạng Yes/No question `->` if/whether + mệnh đề)

`3`. It was lunch time when my boyfriend rang.

I was having luch when my boyfriend rang.  (thì quá khứ tiếp diễn diễn tả một hành động quá khứ đang xảy ra và một hành động khác xen vào)

`4`. You should eat breakfast, so you don't get hungry during the class.

If you don't eat breakfast, you will get hungry during the class.

Câu điều kiện loại 1: If + S + V(s,es), S + will/can/may... + V.

`5`. I don't have enough apples, so I can't bake an apple pie this afternoon.

If I had enough apples, I could bake an apple pie this afternoon.

Câu điều kiện loại 2: If + S + Ved/V2, S + would/could/might... + V.

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`1`. I bought a new typewriter. It costs me a lot of money. (which)

I bought a new typewriter which costs me a lot of money.

Đại từ quan hệ "which" chỉ vật.

`2`. It was raining. We decided to postpone our camping. (Since)

Since it was raining, we decided to postpone our camping.

Since = because: bởi vì

`3`. My sister has to cook dinner for the family. She is very tired. (however)

My sister has to cook dinner for the family; however, she is very tired.

However: tuy nhiên

`4`. Ba missed the Math test yesterday. He will have to do it next week. (therefore)

Ba missed the Math test yesterday; therefore, he will have to do it next week.

Therefore: vì vậy

`5`. Her mother took her to the zoo. She showed her some rare animals. (and)

Her mother took her to the zoo and showed her some rare animals.

And: và