can not的過去式

　　I could not work in these conditions any longer.

　　我再也不能在這樣的環境中工作了。

　　He was emphatic that he could not work with her.

　　他強調他不能與她共事。

　　I could not bring myself to confront him about it.

　　我不能就此事讓自己與他對質。