It is a pity that such a thing ( should ) happen in your class.这种事竟然发生在你们班上，真是遗憾!

It is a pity that he is ill. 他生病了，真遗憾!

16. It doesn't matter whether ( if ) …

该句型中whether(if) 引导的从句是真正主语，该句型常译为　”不论(是否)…没关系…

It doesn't matter if they are old.

17. It is kind ( of sb. ) to do sth.

该句型中的不定式短语是真正主语，如果不定式的逻辑主语是由 of引起，主句中的形容词必须是能表示逻辑主语特征的形容词。常见的有：

bad , brave , careless, clever , cruel , foolish , good (好心的)， honest , horrible , kind , lazy , modest , naughty , nice(有教养的)， polite, rude , silly , stupid , wise , wrong(错误的)等。 这个句型可以改写为：sb. is kind to do sth.

It is kind of you to say so. = You are kind to say so.

18. It is necessary ( for sb. ) to do sth.

该句型与上一个同属一个句型。如果不定式的逻辑主语是由for引起，主句中的形容词通常是表示重要性，紧迫性，频繁程度，难易，安全等情况的形容词。常见的形容词有：① important, necessary, natural ② easy , safe , common , normal , hard , difficult , dangerous , unusual, rare , impossible , pleasant等。

在①中的形容词作表语可以用从句改写， 如：

It is important for her to come to the party. = It is important that she (should ) come to the party

19. It looks ( seems ) as if …

该句型中it无意义。 as if 引导一个状语从句。常译为，“看起来好象…”如果与事实不相符合，则用虚拟语气。

It looks as if he is ill.(真的病了)

It looks as if he were ill. (没有生病)

It seemed as if he were dying.

20. We think it important to learn a foreign language.

该句型中的it 作形式宾语。为了记忆方便我们可称该句型为“6123结构”。6指主句中常用的动词：think, believe, make, find, consider, feel;1指的是形式宾语it; 2指的是宾补的两种形式：形容词或名词;3指的是真正宾语的三种形式：不定式短语，动名词短语或that引导的宾语从句。

We think it our duty to clean our classroom every day.

He felt it important learning English well.

They found it difficult that they would finish their work in two days.

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