1、名词，want sth表示想要某物。2、代词。3、动词不定式，want to do sth表示想要做某事。4、接被动形式的动词不定式或主动形式的动名词，表示“需要”的意思。5、由that引起的宾语从句，表示“请求、命令、建议”等，主要用于美式英语中。6、介词。

例句

I want an explanation from you, Jeremy

杰里米，我需要你解释一下。

Do you want another cup of coffee?

你想再来一杯咖啡吗？

I want to say how really delighted I am that you're having a baby

我想说你怀孕了我有多高兴。

The windows wanted cleaning

窗户该擦了。

He has killed many in his time, and is wanted in at least three countries

他那个时候杀了很多人，现在至少有3个国家在通缉他。