`11`. I am used to getting up early in the morning.

`->` be used to + Ving: trở nên quen với việc gì

`12`. Because Tom was lazy, he failed the exam.

`->` Because + S + V = because of + N/Ving: bởi vì

`13`. Because it rained heavily, we couldn't keep on clearing the beach.

`->` Because + S + V = because of + N/Ving: bởi vì

`14`. Because Tom was lazy, he failed the exam. (giống `12`)

`->` Because + S + V = because of + N/Ving: bởi vì

`15`. My sister took care of our children when we were away.

`->` look after = take care of ( v ) chăm sóc 

`16`. Why don't we use energy-saving appliances ?

`->` How about + Ving = Why don't we + Vinf

1 I'm used to getting up early in the morning.

⇔S + be used to + V-ing: thói quen ở hiện tại

2 Because he was lazy, he failed the exam.

⇔Because + S + V + (O).

3 Because it was raining heavily, so we couldn't keep on cleaning the streets.

⇔Because + S + V + (O).

4 Because he was lazy, he failed the exam.

⇔Because + S + V + (O).

5 My sister took care of our children when we were away

⇔take care of= look after

6 Why don’t we use energy-saving appliances

⇔Why don't we/you + Verb (nguyên mẫu) + …?