物的性质)有：easy, difficult, hard, important, possible, impossible, comfortable, necessary等。

　　It's easy for me to do that.

　　对我来说做那件事很容易。

　　②用于句型"It is ＋adj.＋of sb. to do sth."中常见的形容词(用于说明人的品质)有：kind, nice, stupid, rude, clever, foolish, thoughtful, thoughtless, brave, silly, selfish等。

　　It's very kind of you to help us.

　　你帮我们的忙，你真是太好了。

　　(2)动名词作主语时，前面可加代词或名词所有格表示动名词的逻辑主语。

　　Jane's joining the singing team gave them a surprise.

　　简加入歌唱队使他们很吃惊。

　　(3)某些形容词与 the 连用，也可作主语。当"the＋形容词"指物表示抽象概念用作主语时，谓语常用单数形式；表示一类人用作主语时，谓语常用复数形式。

　　The good is not always beautiful.

　　好的东西并不总是美的。

　　(4)there be句型中，主语通常放在be之后。

　　There is nothing to get excited about.

　　没有什么值得激动的。

　　(5)不定式或动词­ing形式作主语时，句子的表语往往和主语在形式上保持一致。

　　To see is to believe.＝Seeing is believing.

　　眼见为实。

　　[即时演练2]

　　(1)用所给词的适当形式填空

　　①It was stupid of you to_get (get) involved.

　　②It's no use crying (cry) over spilt milk.

　　③The rich are (be) not always happy, though.

　　④Missing (miss) the train means waiting half an hour.

　　⑤There were many people waiting (wait) outside of the shop.

　　(2)完成句子

　　①It_is_kind_of_you_to_help me out of trouble.

　　你太好心了，帮我摆脱困境。

　　②Generally, the_young_are_more_active than the old in such work.

　　通常在这样的工作中年轻人比老年人更积极。

　　③There_is_a_car_racing every year near our town.

　　在我们镇子附近每年都有一场汽车比赛。

④Their_winning_the_match is an inspiration to all of us.