例 It was because he was ill that he didnt come to school yesterday.

　　3. 在强调not until结构时必须把not与until一起放到被强调的位置上

　　例 It was not until she took off her dark glasses that I realized she was my brother.

　　4. 注意强调句型与定语从句的区别

　　例 It was at 7 oclock that he came here yesterday.( 强调句型)

　　It was 7 oclock when he came here yesterday.(定语从句)

　　六、It 常用的固定搭配

　　1. make it

　　(1).在口语当中相当于succeed,表示：成功、做到、说定、赶上、及时到达

　　例 Its hard to make it to the top in show business.

　　(2).在口语中相当于fix the date for,表示约定好时间

　　例 Shall we meet next week?

　　OK. We just make it next Saturday.

　　2. as it is

　　(1).相当于in fact, in reality表示事实上，实际情况是

　　例 We had planed to finish the task today, but as it is we probably wont finish it until next week.

　　(2).相当于方式状语从句，表示照原样

　　例 Leave the table as it is.

　　3. as it were 相当于as one might say, that is to say, 表示也就是说，可以说，换句话说

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