It + be + 时间段 + since / before …句型 句型 It will/won’t be+ 时间段+before… 意义 要等多长时间才……/ 过不了多长时间就…… 备注 It was/ wasn’t + 时间段 +before… 过了多长时间才……/ 没过多长时间就…… 1.从句中用短暂性动词表示动作持续了多久 2.从句中用延续性动词表示动作结束了多久 3.从句要用一般过去时 It is/has been + 时间段 自从……以来已经有多长时+since 间了 It will be two years before he comes back from abroad. 要等两年他才回国。 It won’t be two years before he comes back from abroad. 过不了两年他就回国。 It was two years before he came back from abroad. 过了两年他才回国。 It wasn’t two years before he came back from abroad. 没到两年他就回国了。 It is/has been two years since he came back from abroad. 他回国已经两年了。 It is/has been two years since he lived abroad. 他不在国外已两年了。 How long do you think it is _________ he arrived here？ -- No more than half a year, I believe.
It was two years later _______ he came back from abroad. It is two hours ______ he spends on English every day. It was at 6 o’clock _______I got up today. It was 6 o’clock _______ I got up today.
1. It is / was (high / about) time +(that)… “是做……的时候了”，从句的谓语动词用：① 过去式（be用were）② should+ 动词原形，should 不可省, 表示虚拟语气。
It is time that he came back from abroad. 他早该回国了。
2. It + is + the first / second …time + that… It is the first time that I have visited the Great Wall.
3. It + was + the first / second… time + that… It was the first time that I had visited the Great Wall.
4. It + be + 时间点 + when …引导的时间状语从句
It will be tomorrow morning when we leave for Beijing. 我们去北京时将是明天早晨。 It was 9 o’clock when we got home. 我们到家时已经九点了。
It+be+时间段+since,before....句型
