专业四八级-填空题常考结构 12(在线收听

二十、It结构

一、强调句型   It is + 强调部分+that +其余部分


这个句型需要注意几点:强调部分+其余部分是一个完整的句子;强调部分可以强调主语、宾语和状语,不能强调谓语和定语;强调人使用who或者that, 其他的只能用that (即使是时间和地点),who 和that绝对不能省略如果原句是过去时态,强调句型使用it was.,例如:  原句:  Ann bought these books last year.     强调宾语:It was these books that Ann bought last year.     强调状语:It was last year that Ann bought these books.

二、形式主语 It is + 名词/形容词+ to do/that 引导的句子 to do/that 引导的句子是真正的主语,it 是形式主语,这是为了避免头重脚轻。

例1:It is the interaction between people , rather than     A               B    the events that occur in their lives , that are                   C    the main focus of social psychology.            D 分析:Rather than …是插入语,主句是强调句型, it is …that, 主语是interaction, 所以是is

例2: ___an increasing international exchange of    educational films.    (A) It is    (B) There is    (C) Though there is    (D) Although it is 分析:缺少主谓,选择B, it 用在句子的句首,只可能作强调句型或者形式主语。空格后是一个名词短语,只有B与之构成完整的句子。A语义不完整,C、D则使整个句子成了让步从句而缺主句,故都可排除。
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