直到他的父母回来他才吃饭。

句型10：比较级＋and＋比较级

[意思]越来越......

The baby cried harder and harder.

那孩子哭得越来越厉害。

句型11：the＋比较级，the＋比较级

[意思]越......就越......

The more one has,the more one wants.

越有越贪。

句型12：...as＋adj./adv.＋as...

…not as(so)＋adj./adv.＋as...

[意思]A和B一样......

A不如B......

Do you think that art is as important as music？

你认为艺术和音乐一样重要吗？

Last Sunday the weather was not so wet as it is today.

上个星期天的天气不如今天的天气潮湿。

句型13：more/less＋adj.＋than...

[意思]A比B更......

A不如B......

I think art is less important than music.

我认为艺术不如音乐重要。

句型14：stop…from doing sth.

[意思]阻止......做某事

The Great Green Wall will stop the wind from blowing the earth away.

绿色长城将阻挡风吹走土壤。

句型15：both...and...

[意思]A和B都......

Both you and I are students.

我和你都是学生。

句型16：either...or...

[意思]要么…要么…；不是…就是…

Either you or he is wrong.

不是你错就是他错。

句型17：neither...nor...

[意思]既不......也不......

Neither he nor I am a student.

我和他都不是学生。

句型18：...as soon as...

[意思]一......就......