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it构成的几个易混淆句型用法辨析及典例演练
It+be +时间段+since引导的状语从句：
It is/has been + 时间段 + since + 一过(did)
It was + 时间段 + since + 过完(had done)
eg. It is/has been 10 years since he came here.
=Ten years has passed since he came here.
It was years since he had arrived in China.
注: since从句的谓语v.一般是非延续性v.(按字面意思译)
亦可用延续性v或状态v.(应译为否定/相反)
eg. It is three years since she came to our class.她来我们班已经有三年了。
It is three years since she was in our class.她离开我们班已经有三年了。
It is ten years since I smoked =It is ten years since I stopped smoking我戒烟十年了.
牛刀小试:
(安徽高考) That was really a splendid evening. It’s years _____ I enjoyed myself so much.
A when B that C before D since
It is almost five years _________ we saw each other last time.
Keys: since, since
2. It +be +时间段+before引导的状语从句：
It + is (not) /will (not) be + 时间段 + before + 现在时 (要过多久/不久…才…)
It + was (not) / would (not) be + 时间段 + before + 过去时 (过了多久才…)
注：“before”句型和“since”句型的共性都加时间段,差异在于前后的时态和翻译。
It will be a long time before…很久才能…
It will not be long before…不久就…
eg. It will be ten years before I return home. 要过十年我才能回家.
It was ten years before he found his lost boy. 过了十年他才找到了他失踪的儿子.
牛刀小试：
1) It is reported that it may be two or three months _____ it is possible to test this medicine on animals.
2) －How long do you think it will be ______ China sends a manned spaceship to the moon？
－Perhaps two or three years
3) (2005山东24) It was some time ___D___ we realized the truth.
4) The field research will take Joan and Paul about five months; it will be a long time ____ we meet them again.
Keys: before, before, before, before
3. It + be + 时间点+ when引导的状语从句：
It + was + 时间点 + when-clause(从句谓语用一般过去时)
It + will be + 时间点 + when-clause(从句谓语用一般现在时表将来)
It is/ was + 时间点 + when + … 做某事时在某具体的时间
It is/ was + 时间状语 +that + … 是在某时间做的什么事（强调句）
eg. It was already evening when he came back.当他回家时已经8点了。
It will be midday when they get home.当他们到家时将是中午。
注：It was +时间点+when+一般过去时的从句 与“before”句型比较:前后时态一致
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