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句型标记
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时态要求
did代表一般过去时；
do/does代表一般现在时。
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句意和例句
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1. It is (high) time that
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did/should do
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是该做……的时候了
It's high time (that)kids went to bed.
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2. would rather 后接从句
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did
注：区分would rather do
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宁愿某人做……
We would rather (that)you told the truth.
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3. It is/was strange that 从句
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should do（现在、将来）
should have done（过去）
注：should表示“竟然、居然”，从句时态用虚拟式。
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很奇怪她居然……
It was strange that he should have declined such an offer.
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4. make sure that从句
ensure that
be sure that
guarantee that
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does/do
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务必要……
Do make sure that you follow the directions.
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5. in case或for fear that后的从句
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does/do或should do
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以防万一、唯恐……
Take your phone in case we contact you.
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6. no sooner…than…或:
hardly…when…
barely…when…
scarcely…before…
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前句had done（过去完成）；
后句did（一般过去）
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不等……就……或：
刚刚……就……
Hardly had they reached the destination when their car broke down.
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7. It is/was段时间since
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did/had done
注：
（1）since从句后的时态要和主句对应。
（2）有时主句也可以是it has been=it is
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自从……已经……了
已经……那么久没有……了
It is a couple of days since I met him on campus.
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8. It is the first time that
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has/have done
注：这个句型的识别关键在于主句中的序数词。所以我们可以这样理解：主句出现序数词，后面从句就可能为完成态。
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这是第……次做……
She was the first woman who had been appointed to this position.
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9. if only/ as if /wish
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虚拟语气，即：
现在：did（系动词一律为were）
将来：did或were to do,或could、would、should、might等情态动词。
过去：had done
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但愿/仿佛/（不切实际）希望
If only everyone could own their own houses.
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10. 主句was doing/was about to do…
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when从句用过去时did
注：在这种情况下when解释为“就在那时”。
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正要/正在…就在那时…发生了
I was passing a form when I thought of visiting a friend of mine living there.
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