四、 通常不能用于过去进行时的动词主要有：agree, be, believe, belong, care, forget, hate, have(拥有), hear, know, like, love, mean, mind, notice, own, remember, seem, suppose, understand, want, wish等。

误：I was knowing the answer.正：I knew the answer. 我知道答案。误：I wasn't understanding him.

正：I didn't understand him. 我不明白他的意思。