rush hour is tiring. (抽象)(具体) ? It+ be +名词/形容词+ to do ? It+ be +形容词 for sb /of sb + to do ? It takes/took sb +时间+to do It is necessary ____________(spend) enough time on English if you want to learn it well. to spend 1). To make a plan first is a good idea. = It is a good idea to make a plan first. 2). It takes three hours to walk there . It is possible for him to master the art of speaking . It was careless of him to break the coffee cup. = He was careless to break the coffee cup. 2. 动名词或不定式都可以在句中作主语,但在下列句型中常用动名词作主语。 It is/was no use/good not any use/good of little use/good useless +doing sth . It is no use crying over spilt milk. It is of little good staying up too late every day. 若主语和表语都是非谓语动词, 应保持形式上的一致。 Seeing is believing. To see is to believe.
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