1.为平衡句子,通常把不定式作主语改为it作形式主语,即(1)It’s+adj./n.for sb. to do sth.常见形容词有:easy, difficult, convenient, possible, necessary等。
It is possible for me to make a tour around the world.
(2)It’s+adj.+of sb. to do sth.
常见的形容词有:kind, good, nice, wrong, careless, honest, wise, foolish, polite, clever, right, unwise, stupid, thoughtful, rude, silly, impolite等。表示某人的品行。
It is honest of the boy to tell the truth.
2.It is+no use/no good/useless/senseless+doing sth.
例:It is no use debating with him about the problem.(跟他争辩这个问题没用。)
3.It is + adj./n. +that-从句。
1)It is certain that Yao Ming plays a very important role in his team.
(2)It is no wonder that he was late for the meeting again.(难怪,他开会又迟到了。)
1】当形容词或名词表示说话人的态度、语气时,从句要用虚拟语气(should)+ do…意为“居然、竟然、应该、应当”。常见形容词或名词有strange, surprising, funny, important, necessary, a pity, a shame 等。例:It is strange that he (should) go by himself.(真奇怪,他居然一人去了。)
2】名词表示命令、建议、忠告等,从句要用虚拟语气(should)+do,意为“应该,应当”。常见名词有:suggestion, advice, order, request等。例:It is his suggestion that his son (should) stay at home at weekends.
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