You and I.和You and me.这两种说法都正确吗?什么时候用主格?什么时候宾格?怎么区分?最好能举例

You and I will talk this over.
我俩商量商量.
It's where you and I come in.
这在你和我进来的地方.
Here is a box,for you and me.
有一个盒子,送给你和我.
So it must be,that you and me.
所以你和我必须在一起.
简而言之,you and I作主语,you and me 作宾语.