We were in grave danger.

我们处于极大的危险之中。

I am in grave danger, my friend.

我现在很危险，我的朋友。

I said, "Grave danger?"

我说“致命的危险吗？”

It could put my father in grave danger.

这会将我父亲置于非常危险的境地。

Ibelieve you and I are in grave danger.

我担心我们的处境都很危险。