2012大学英语四级语法：强调句型

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强调句型 　　这里讲的强调句主要是以it为引导词的分裂句。其构成形式为：It is (was) +被强调部分+ that(who, which) + 句子的其他部分。被强调的部分通常为主语、宾语和状语。
　　It is only when one is ill that one realizes the value of health.
- f+ l4 B: q0 p" ?　　It is what you will do that is essential.
　　Note:
4 u$ d7 K+ O) A! z. R% _　　在被强调部分的后面，一般用that引出句子的其他部分。但是如果强调的部分是表示人的名词，那么也可用who;如果是指物的名词也可用which。
　　It was Jane that/who lent me the money.
' t. M4 O- s5 J, b  d+ y  G　　It was this novel that/which they talked about last night.中华考试网(www．Examw。com)
　　如果强调的是原因状语从句，只能用because引导，不能由since, as或why引导。
　　It was because(不用since或as) he had never had the opportunity that John hadn’t learned to drive.
　　有三类句子成分不可以进行强调，即表语、谓语动词和由though, although,　whereas等引导的从句。
9 ?9 `* c4 k4 g* Z　　It is although he is young that he can speak four languages. (误)考试用书
/ J% I+ _% p# D6 @9 Y  X　　Although he is young, he can speak four languages. (正)
7 D# P. j/ {$ ?+ [5 W　　It is whereas he prefers pop song that I like classical music. (误)
　　I like classical music whereas he prefers pop songs. (正)