介词短语作定语：

　　The boy in the classroom needs a pen of yours.教室里的男孩需要你的一支钢笔。

　　The boy in blue is Tom.穿兰色衣服的孩子是汤姆。

　　There are two boys of 9,and three of 10.有两个9岁的，三个10岁的男孩。

　　名词作定语：

　　The boy needs a ball pen.男孩需要一支圆珠笔。

　　It is a ball pen.这是一支圆珠笔。

　　There is only one ball pen in the pencil box.这铅笔盒里只有一支圆珠笔。

　　副词作定语：

　　The boy there needs a pen.那儿的男孩需要一支钢笔。

　　The best boy here is Tom.这里最棒的男孩是Tom。

　　不定式作定语：

　　The boy to write this letter needs a pen.写这封信的男孩需要一支钢笔。

　　The boy to write this letter is Tom.将要写这封信的男孩是汤姆。

　　There is nothing to do today.今天无事要做。

　　分词(短语)作定语：

　　The smiling boy needs a pen bought by his mother.那个微笑的男孩需要一支他妈妈买的钢笔。

　　The pen bought by her is made in China.她买的笔是中国产的。

　　There are five boys left.有五个留下的男孩。

　　定语从句：

　　The boy who is reading needs the pen which you bought yesterday.那个在阅读的男孩需要你昨天买的钢笔。

　　The boy you will know is Tom.你将认识的男孩叫汤姆。

　　There are five boys who will play the game.参加游戏的男孩有五个。