高中英语it用法归纳:形式it
1.形式主语:不定式、动名词以及主语从句作主语时,为避免头重脚轻,要将真正的主语后置。
It seemed impossible (for him) to get back home.
It was worthwhile searching for his roots.
It was obvious that his ancestor taught his younger generation little of his own language.
1. It is clear ( obvious, true, possible, certain) that
该句型中it 是形式主语,真正的主语是 that 引导的主语从句,常译为 清楚(显然,真的,肯定)是主语从句最常见的一种结构。
It is very clear that hes round and tall like a tree.
= That hes round and tall like a tree is very clear.
2. It is important ( necessary, right, strange, natural...) that ...
该句型和上一个同属一个句型。由于主句中的形容词不同,that 后的从句中要用虚拟语气(should + 动词原形),should 可以省去。建议记住该句型中的形容词。
It is important that we (should) learn English well.
It is necessary that he (should) remember these words.
3. It is said (reported, learned) that
该句型中的it 仍是形式主语,真正主语是 that 引导的主语从句。该结构常译为 据说(据报道,据悉)。
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