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。