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.yygrammar.com)误：It was although he was tired that he went.
