含有“It is …”的句型

　　(1)It is time (for sb.) to do sth.

　　It is (high) time that sb. did sth.(虚拟语气)

　　(2)It is + 形容词(+of / for sb.)+ to do sth.

　　通常用 of的词有brave、clever、careful、hopeless、kind、good、naughty、nice、silly、stupid、foolish、wise等。

　　(3)It is + 形容词 + that + sb. + (should) do sth.(虚拟语气)

　　能用于这个句型的形容词有strange、wonderful、natural、good、proper、right、wrong、well、fortunate、important、necessary、useless、likely、probable、impossible等。有时可省去should而直接用动词原形。如：

　　It is important that we should pay close attention to grain.

　　It is natural that he(should)say so.

　　(4)It is no use/ good + doing sth.

　　It is no use trying again = It is of no use to try again.

　　(5)It is + 被强调部分 + that/who + …

　　Was it in the street that you met her?

　　Who was it that called him“comrade”?

　　It was not until yesterday that I met my old friend.

　　It is in a small factory that my brother is going to work.(注意上述各句均为强调句型的“考点”)

　　比较：It is a small factory where my brother is going to work.(定语从句)

　　(6)It is said/reported/announced/ (well) known … that…

　　(7)It is/was + 时间 + since … 从……已多久了。

　　It is three years since I met him in Beijing.

　　It was a long time since I (had) lived in that small mountain village with these farmers.(注意两句中的时态)

　　It is five months since I arrived in New York.我到纽约已经五个月了。

　　It is five months since I was in New York.我离开纽约已经五个月了。

　　(注意：终止性动词表示从动作发生时算起;如果是状态动词或持续性动词，则从动作或状态结束时算起。)

　　(8)It is + 时间 + before …

　　这个句型和上面句型中时间都是时间段，如long、years、months、weeks、five days、three hours、twenty minutes等。不过主句的时态多用一般将来时或一般过去时。

　　It will be several years before we meet again.

　　我们要过好几年才能再见面。

　　It was not long before they set out for the front.

　　不久他们就出发去了前线。

　　(9)It is /was/will be the first/second/third … time that …

　　It is the first time that I have been here.

　　It was the second time that he had seen the film.

　　(10)It is up to sb. to do sth … 应由某人做某事。

　　It is up to you to decide whether we start or not.

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