英语语法强调句知识点：It is...that…句式通常不能强调哪些成分

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　　有这样一道考题：

　　It was a teacher that she __________.

　　A. was B. seemed C. looked D. married

　　此题应选D。从句意上看似乎4个选项都行，其实这里只能填D。因为填A，B，C 中的任意一个选项，都会导致句中的 a teacher成为表语，然而按照强调句句法规则，It is...that这一强调句型是不能强调表语的。一般说来，以下成分不能用于强调句中的被强调部分：

　　1. 表语：

　　她很美。

　　正：She is beautiful.

　　误：It is beautiful she is.

　　他是医生。

　　正：He is a doctor.

　　误：It is a doctor that he is.

　　但是宾语补足语却可以用作被强调部分：

　　他们选他担任主席。

　　正：They elected him chairman.

　　正：It was chairman that they elected him.

　　2. since 和 as 引导的原因状语从句(但 because 从句却可以)：

　　他不能来是因为他病了。

　　正：It is because he is ill that he cant come.

　　误：It is since[as] hes ill that he cant come.

　　3. although 引导的让步状语从句：

　　虽然累了，但他还是去了。

　　正：He went although he was tired.

　　误：It was although he was tired that he went.