It is...that通常不能強調(diào)哪些成分　　

請看一道題：　　

It was a teacher that she __________. 　　

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

此題應(yīng)選D。從句意上看似乎4個選項都行，其實這里只能填D。因為填A，B，C 中的任意一個選項，都會導(dǎo)致句中的 a teacher成為表語，然而按照強調(diào)句句法規(guī)則，It is...that這一強調(diào)句型是不能強調(diào)表語的。一般說來，以下成分不能用于強調(diào)句中的被強調(diào)部分：　　

1. 表語：　　

她很美。　　

正：She is beautiful. 　　

誤：It is beautiful she is. 　　

他是醫(yī)生。　　

正：He is a doctor. 　　

誤：It is a doctor that he is. 　　

但是賓語補足語卻可以用作被強調(diào)部分：　　

他們選他擔(dān)任主席。　　

正：They elected him chairman. 　　

正：It was chairman that they elected him. 　　

2. since，as原因狀語從句(但because從句卻可以)：　　

他不能來是因為他病了。　　

正：It is because he is ill that he can’t come. 　　

誤：It is since[as] he’s ill that he can’t come. 　　

3. although引導(dǎo)的讓步狀語從句：　　

雖然累了，但他還是去了。　　

正：He went although he was tired. 　　

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