purpose  

I. n.

1.目的,目标,意图 (c)

  What is his purpose in coming? 他来的意图是什么？

  What is the main purpose of this building？这栋建筑的用途是什么？

  What is your purpose in doing this?

  I have a purpose in making this trip to Europe.

2.毅力,意志,决心(u)

  be firm in purpose 意志坚定

  Her approach to the job lacks purpose. 她干这项工作缺乏毅力。

II. vt.

1.打算(做),决意(做)  (+doing sth. / to do sth.)

  What do you purpose？ 你打算做什么？

  We purpose making/to make another trail. 我们打算再试一次。

  We purpose that the experiment shall be carried out before long.

  我们决意不久就做这项实验。

要点归纳：

purpose 用作名词分两种情况：可数名词,表“目的,用途”；

                            不可数名词,表“毅力,决心,意志”；

          作及物动词时表“意图,意欲做……”，后接to do /doing sth。

知识链接：

由 purpose 组成的短语有：

1).on purpose (= by intention, deliberately)

   ①.故意地,有意地,特意,反义词 by chance/by accident 无意地,偶然地

   She did it on purpose, of course.

   I've come on purpose to speak to you.

   ②.为了：

   He came here on purpose to discuss it with you. 他到这儿来是要与你讨论这件事。

2).for … purpose为了…目的

   For what purpose did you do such a thing？ 你做那件事目的何在？

   For what purpose did your committee invite me to come here?

   You don't think that he sent you here for that purpose?

3).for/with the purpose of … = for the aim of 出于……目的

   Did you come to London for the purpose of seeing your family, or for business purpose?

   If I go there in future, it will be for the purpose of seeing you.

4).to the purpose (= to the point)得要领的, 中肯的

   He said something that was (not) to the purpose.

   他说了一些中肯（不中肯）的话。