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he 你要離開教室,應該先問一問我們的老師。 (2)當句子的主語是物時, be supposed to 用來表示某事物本應該發(fā)生而沒有發(fā)生。如: The meeting was supposed to take place on Tuesday, but we have to put it 該在星期二舉行,但我們不得不把它推遲了。 (3)be supposed to 的否定形式為 be not supposed to do,意為“不應該做某事”,表示命令和禁止。如: You are not supposed to talk loudly in 。 You are not supposed to smoke on the 。 2. be expected to do 的用法 點撥 be expected to do 為被動語態(tài)的結構,意為“被期許 (預期 )會做某事 ”。如: John is expected to e to the party 。 He is expected to do well in the 。 3. It is+ adj.+ to do 點撥 It is + adj.+ to do 表示 “ 做某事 ??” 。如 : It39。s very important to study English 。 (1)若形容詞是描述行為者的性格、品質(zhì)的 , 如 kind, good,nice, right, wrong, clever, careless, polite, foolish 等時 , 用 It39。s+ adj.+ of do sth.。如 : It39。s very kind of you to help ,