1. 将非强调句判为强调句
前面讲到强调时间状语时，通常要用it is…that…，而不用it is … when…，所以有的同学对于下题选择了A：
It was ten o’clock ______ he came back.
A. that B. when
C. so D. which
其实此题最佳答案为B，这不是一个强调句型。When引导的是一个时间状语从句，全句意为 “当他回来时，时间是10点钟”。比较以下强调句型：
It was at ten o’clock that he came back. 他是10点钟回来的。
It was after ten o’clock that he came back. 他是在10点过后回来的。
It was before ten o’clock that he came back. 他是在10点前回来的。
再比较：
It is autumn when leaves fall. 当树叶落的时候就是秋天了。
It is in autumn that leaves fall. 树在秋天落叶。
另外，下面的句子也不是强调句型：
(1) It’s a long time ______ I met you last.
A. that B. since
C. when D. which
(2) It was more than a year now _____ he had seen her.
A. that B. since
C. when D. which
(3) "Was it here _____ you were away talking to a friend?" "Sure. But when I got back there, it was gone."
A. that B. while
C. which D. where
以上三题均选B，即前面两句填since，其意为“自从”;第(3)填while，其意为 “在…期间”。
2. 将强调句判为非强调句
有些强调句型由于句子本身有一定的特殊性，比如是强调句的特殊疑问句形式，强调句型情态动 词或复杂时态等，强调句中的被强调成分过于复杂，强调句与其他从句混杂在一起，等等，这都可能掩盖 强调句型的本来面目，从而导致误判：
(1) When was _____ that the general manager left for Japan?
A. he B. it
C. that D. since
答案选B，为强调句的特殊疑问句形式。
(2) It might have been John _____ bought a present for Mary yesterday.
A. that B. when
C. what D. which
答案选A，为强调句型，只是其中的动词be采用了might have been这一复杂结构。
(3) It was what he meant rather than what he said ______ annoyed me.
A. which B. as
C. what D. that
答案选D，为强调句型，被强调部分为 what he meant rather than what he said，句意为 “让我生气的不是他说的话，而是他话中的意思”。
(4) It was just in the room _____ he was born _____ he died.
A. where, which B. that, that
C. where, that D. which, that
答案选C，为强调句型，被强调成分是 in this room，where he was born 为修饰 the room 的 定语从句。
(5) It was lack of money, not of effort, _____ defeated their plan.
A. which B. as
C. that D. what
答案选C，为强调句型，被强调成分为 lack of money, not of effort。
