It is I thatwho am your English teacher.

　　1. 对比：

　　It was Li Lei’s brother that you met in the street yesterday. It is exciting that we have succeeded in sending up Shenzhou V. 将句中的It is/ was + …+ that/ who同时去掉，句子依旧成立 2. 对比： It was the English book that I bought yesterday. It is an English book (which that) I bought yesterday.

　　强调句的be必须与that后的时态一致，引导词只用that 和who,

　　主语从句 定语从句 3. 对比： It is such an interesting book that we all like very much. It is such an interesting book that we all like it very much. 强调句的it不作任何成分，无实际意义，只起强调作用

　　结果状语从句 三. 牢记 not … until … 句型的强调句 　It is/ was not until + 被强调部分 + that + 其它部分 　 e.g. He didn't go to bed until/ till his wife came back.

　　强调句：It was not until his wife came back that he went to bed. 注意：此句型只用until，不用till；

　　句型中It is/ was not … 已经是否定句了，that后面的从句要用肯定句，切勿再用否定句。 例：1. It was not until 11 o’clock

　　the experiment.

　　A. did he finish

　　B. that he finished

　　C. when they finished

　　D. that did he finish　 解析：It is/ was not until + 被强调部分 + that + 其它部分   

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