It is time you went to bed. 你早该睡觉了。
It is (high) time that 后面的从句谓语动词要用过去式或用should加动词原形,但should不可省略。
It is time that the children went to bed. (= It is high time that the children should go to bed.)
30. It is + the first / second time(表次数)+ that从句 这是第一次 /第二次 该结构中的从句部分,用现在完成时。
It is the first time that I have visited the city.
31. It is + 一段时间 + since从句 It has been + 一段时间 + since从句 自从 以来已经
该句型中 It is since可代替It has been since ,意思不变。
It is (= has been) five years since we last met.自从我们上次见面以来已经有五年了。
It is two years since I became a postgraduate student.我成为研究生已有两年了。
注意:since从句中用延续性动词或状态动词的一般过去时,通常表示动作或状态的完成或结束。
It is five years since he lived here.他不住在这儿已五年了。
It is a long time since he smoked.他戒烟已有好长时间了。
It is three years since he joined the army.他参军三年了。
It is three years since he was in the army.他复员(离开军队)三年了。
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