have?been?

How long have you been engaged?
How long have you known her?

在present perfect中什么时候要加上been,什么时候不用been?为什么?请举例子详细说明，谢谢！

have been与have gone have been in 什么时候用 have been? Where have you been? have been的句式。 have you been there? have been done how have you been? 英文翻译：have been living 关于must have been