24. be doing… when…

“正在做……这时……”

be about to do… when…

“正要做……这时……”

We were having a meeting when someone broke in. 我们在开会的时候，有人突然闯入。

We were about to set off on our way when it suddenly began to rain. 我们快动身离开的时候，天突然下起雨来。

25. a good/ large amount of + 不可数n.

(作主语时，谓语动词用单数)

good/ large amounts of + 不可数n.

(作主语时，谓语动词用复数)A good amount of damage was done in a very short time. 短时间内就造成了严重损害。

Large amounts of money were spent on the bridge. 那座桥耗资巨大。

26. in rags 穿得很破烂

The detective dressed himself in rags.那个侦探把自己打扮得衣衫褴褛。

27. take a chance 冒险，碰运气

28. as for 至于，关于，就……而言

= as to He is taking a chance by driving his car so fast. 他冒险把车开得这么快。

As for Tom, he did quite well. 至于汤姆，他做得不错。

考生们只要加油努力，就一定会有一片蓝天在等着大家。以上就是精品学习网的编辑为大家准备的高一英语必修三知识点总结：Unit 3