六、用于强调句型中
It is/was＋被强调部分＋that/who＋其他
(1) It was a dog that she lost last week.
(2) It is Professor Yu who teaches us Chinese culture on Saturdays. 正是余教授每周六教我们中国文化。
(3) It is us whom Professor Yu teaches Chinese culture on Saturdays.
每周六正是余教授给我们教授中国文化。
(4) It is on Saturdays that Professor Yu teaches us Chinese culture.
余教授正是在每周六教授我们中国文化。
注意：被强调部分指“人”时，用who/whom，被强调部分指物时用that。
七、It 构成的常见短语：
1.It's time to do sth: 做某事的时间到了。
2.It is time for sth：…的时间到了。
3.make it：成功、说定、赶上
4.Take it easy. 不要慌。
5.Believe it or not. 信不信由你。
6.It all depends. 那得看情况，还没定。
7.It doesn't matter. 没关系。
8.Forget it. 算了吧，别提了。
9.worth it. 值得做。
10.It's up to sb. 由某人负责/决定。
