Section ⅢGrammar- it的用法(1)

　　语法图解

　　探究发现

　　①It is a beautiful day here and I am sitting under the big tree at the end of the garden.

　　②Your mother tells me that you started smoking some time ago and now you are finding it difficult to give it up.

　　③It is never too late to mend.

　　④It is no use talking to them.

　　⑤It is said that he stole the money.

　　⑥I think it difficult to learn English well.

　　⑦We make it clear that speaking to the teacher in that way is not polite.

　　⑧I don't like it when people talk with the mouth full of food.

　　[我的发现]

　　(1)①句it表示天气，②句第一个it代替to give it up作形式宾语；第二个it代替句中所说的"吸烟"的事。

　　(2)在句③④⑤中it用作形式主语，其中句③用在"It is＋形容词＋(for/of＋sb.)＋动词不定式(短语)"中，it指代动词不定式(短语)；句④用在"It is＋no use/good＋动名词(短语)"中，it指代动名词(短语)；句⑤用在"It is＋said/believed/reported＋that从句"中，it指代that从句。

　　(3)在句⑥⑦⑧中it用作形式宾语，其中句⑥用在"动词＋it＋形容词＋动词不定式(短语)"中，it指代动词不定式(短语)，句⑦用在"动词＋it＋形容词＋that从句"中，指代that从句；句⑧it用在某些特殊的句式中，指代when从句。

　　一、it用作人称代词和非人称代词

　　1．用作人称代词

　　(1)it用来指代前面的名词或前面提到过的事。

　　My friend offered me a beautiful gift yesterday, and I like it very much.

我朋友昨天给了我一件漂亮的礼物，我非常喜欢。