Mary is the girl whose parents work in Japan.

　　　　 Is this the key which you are looking for?

　　　　 October 1, 1949 is the day when New China was founded.

　　　　 This is the house where the great man was born.

　　　　 I don’t know the reason why she looks unhappy today.

行词。

　　　　　 b.定语从句必须用关系词来引导。

　　　　　 c.关系词在定语从句中作一个句子成分.

　　　　　　　　 先行词　 关系词　　 定语从句

不定式的复合结构:for sb.(not) to do sth.

动名词的复合结构:名词所有格或形容词性物主代词+动名词。如:

It's important for us to learn English well.

He prided himself upon his dancing.

不定式作状语通常表示"目的"或"程度";分词作状语通常表示"伴随情况"。"时间"或"原因"等。如:

He went to the library to borrow a book (表目的)

The boy sat at the desk reading a book.(表伴随情况)

3. 在动词remember,forget,regret,stop,try等后面跟动词不定式或动名词时,意义上有所差别。如:

He forgot telling me the news. 他忘了曾经告诉过我这个消息。

He forgot to tell me the news. 他忘了要把这个消息告诉我。

2. 下列动词后只能跟动名词作宾语: enjoy, finish, avoid, practise, mind, escape, excuse, suggest, consider(考虑), give up, can't help等。如:

He wants to give up smoking.

They practise speaking English every day.

1. 下列动词后只能跟不定式作宾语: hope, agree, decide, manage, wish, refuse, dare, promise等。如:

He has promised to lend me the dictionary.

动词不定式作宾语补足语时,表示动作已经发生,动作的全过程已经结束。如:

I heard him knock at the door three times.(=I heard he knocked at the door three times (动作的全过程已经结束)

现在分词作宾语补足语时,表示动作正在进行。如:

I heard him knocking at the door.(= I heard he was knocking at the door.(动作正在进行)

过去分词也可以作宾语补足语。如:

I found the glass broken.(= I found the glass was broken.)

注意:动词不定式作宾语补足语时,在动词make,let,have,see,notice,hear,watch, observe,feel,listen to等后面要省略不定式符号to。如:

I hear him play.

The teacher made him do the exercises again.

help后的动词不定式作宾语补足语时,不定式符号to可加可不加。如:

He often helps me to study English in his spare time.

当这些动词变为被动语态时,原不定式必须加上to。如:

He was seen to repair the machine.

3. 动词不定式作定语时,当所修饰的名词指人时,和它所修饰的名词之间有逻辑上的主谓关系。如:

He is always the first to come to school.

当所修饰的名词指物时,和它所修饰的名词之间有逻辑上的动宾关系。如:

I have a meeting to attend.

如果作定语的动词不定式中的动词是不及物动词,需加上相应的介词。如:

I have no room to live in.

There is nothing for me to worry about.