It is...that…句式通常不能强调哪些成分

It is...that…句式通常不能强调哪些成分

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 can’t come.

误：It is since[as] he’s ill that he can’t 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.(www.hxen.net)

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