Question

before 前动词的时态可以是过去式吗

Answer 1

She didn't know it before. 她原先并不知道
She wouldn't have known it before. 她原先不可能知道

before 之前的时态可以随语境、语气来调整

追问

she wound't know it before不是She wouldn't have known it before.

追答

你是想表达什么意思呢？
英文句子怎么写、用什么时态都要根据你想说什么。

She wouldn't know it 后面不会加 before， 如果要加通常就会用完成时。

Answer 2

可以啊

追问

she didn't know it before 还是she wound't know it before?

追答

句子都是对的~~汉译不同

Answer 3

必须可以啊。
He went to school before he had breakfast.

追问

she didn't know it before 还是she woun't know it before?

追答

前面一种是对的，一般没有后面的说法。