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主語較長,謂語較短時(shí),常用it做形式主語,而將不定式放到謂語的后面?! ∪纾篧e’ll be back in three days. After seven the rain began to fall. What shall we do after graduation? After two months he returned. 注意:after 有時(shí)也可以表示在一段時(shí)間之后(常用在過去時(shí)里) 不定式做主語: 不定式做主語一般表示具體的某次動作。一般多與現(xiàn)在時(shí)、過去時(shí)、將來時(shí)連用?! n 總是跟日子有關(guān),on Monday, on Christmas morning, on the following, on May Day, on a warm morning 等?! ∮胕t 作形式主語的結(jié)構(gòu) (1) It is + 名詞 + 從句 It is a fact that ? 事實(shí)是? It is an honor that ?非常榮幸 It is mon knowledge that ?是常識 (2) It is + 形容詞 + 從句 It is natural that?很自然? It is strange that?奇怪的是? (3) It is + 不及物動詞 + 從句 It seems that? 似乎? It happened that? 碰巧? It appears that? 似乎? (4) It + 過去分詞 + 從句 It is reported that? 據(jù)報(bào)道? It has