也可用其完成时,即:It has been ...since ...。
It was since
①It is/has been five years since I visited the palace. 自从我参观那个宫殿以来已经五年了。 (1)It is (about/high) time that ...是做……的时候了(从句谓语动词用过去式或should+动词原形) (2)It/This/That is/was/will be the first time that ...这/那(将)是第一次……(从句谓语动词用完成时态)
(3)It is/was/will be+时间段+before ...要过多久才…… (4)It is/was+具体的时间点+when ...(when引导定语从句)
②It is time that our exercise books were handed in/should be handed in today. 今天该交练习本了。 ③
two years
she graduates from college. 再有两年时间她就大学毕业了。 [关键一点] 在句型“It is+时间段+since ...”中,如果since从句中的谓语动词为非延续性动词时,则意为“自从……以来多久了”,如果是延续性动词,则意为“不做……多久了”。 It will be before ④It's three years since he joined the army. 自从他参军已经三年了。 ⑤It's three years since he was in the army. 自从他不在部队/退伍已经三年了。 2.His mother
buy him a piano
he was
seven. 直到7岁,他母亲才给他买了一架钢琴。 句式not ...until ...表示“直到……才……,在……之前没……”,until后可接介词短语说明时间也可引导时间状语从句,有时候用never替代not。 couldn't until ①He
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