感冒了...不好意思哈...

Know what's what:know all that needs to be known in a particular situation or in general 内行,有头脑,有鉴别能力

Ask Ann. She knows what's what. She's been here for years. 去问安吧,她在这里很多年了,是个内行.

know where you are/stand:知道自己(在别人心目中)的位置 know what your position is, know what sb expects of you
I don't know where I stand with him. I don't know what he feels about me. 我不知道自己在他心里的位置,也不知道他对我的看法.

Has she talked to you about your chances of promotion? Do you know where you stand? 她对你说起过升职的机会有多大吗?你知道自己有多大把握吗?