want和would 的用法区别.

1、want想,想要,及物动词
want sth想要某物（名词或代词作want的宾语）.例：I want some tomatoes.
want to do sth想做某事（动词不定式作want的宾语）..例：He wants to see a film.
want sb to do sth想让某人做某事（动词不定式做宾语sb的补定语）.例：Ted's father wants him to have two cakes.
2、would为情态动词,没有人称和时态的变化.
would like sth想要某物.例：I would like some tomatoes.
would like to do sth想做某事（动词不定式做would,like的宾语）.例：I would like to see a film.
would like sb to do sth想让某人做某事（动词不定式做宾语sb的补足语）.例：Ted's father would like him to see a film.
由以上解析可以看出want=would like,只是would like的语气比want显得委婉,更适合服务场所.
3、但在问句中,他们的表现形式却是迥异的.
例如在疑问句的结构上：
Do you want some tomatoes?（助动词do引导）
Would you like some tomatoes?（情态动词would提前）
Does he want some tomatoes?（有人称和时态的变化）
Would you like some tomatoes?（没有人称和时态的变化）
What do you want?
What would you like?