1. I think I will be able to build a small tree house in 3 weeks with my friends' help.

2. If I have a lot of money, I will travel around the world.

3. People will have the ability to save our environment if we stop making it polluted.

4. He promises that clothes will give away to the poor people.

5. Although Dave is not being able to come to Sue's birthday party, he sent the gift to her.

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`1`. I think I will be able to build a small tree house in 3 weeks with my friend.

`⇒` Cụm be able to = can: có thể

`2`. If I have a lot of money, I will travel around the world.

`⇒` Cấu trúc: If + S + V (HTĐ), S + will Vo

`3`. People will have ability to save our environment if we stop making it polluted.

`⇒` Cụm be able to Vo = have ability to Vo

`4`. He promises that he will give away his clothes to the poor people.

`⇒` Cấu trúc: S + promise + S + will Vo.

`5`. Although Dave couldn't be able to Sue' birthday party, Dave sent the gift to her.

`⇒` Cấu trúc: Although + S1 + V1, S2 + V2

`⇒` Cụm be able to Vo: có thể làm gì đó.