我不知道之前这些房子是什么样的。

I don't know how does the house looks like before.

youdao

阅读可以帮助我知道的事情，我不知道之前。

Reading helps me to know things that I do not know before.

youdao

我不知道之前房屋的样子，但我知道老人自己无法重新建起。

I don't know how many schools collapsed, But I know at that time many classrooms were full of students.

youdao

I don't know how many of you have not read any Plato before, but for those of you who haven't, I actually think you're in for a treat.

我不知道你们当中有多少人,之前未曾读过柏拉图的作品,但是,还未拜读过柏拉图的同学们,我敢肯定你们会喜欢上他的

耶鲁公开课 - 死亡课程节选

As saying in a television interview, this is Allen Greenspan while I was aware of a lot of these practices, these lending, were going on, I had no notion of how significant they had become until very late.

这是他接受采访时说的，艾伦，格林斯潘说,我之前i就知道有很多不规范行为，：，“,这些借款，但我不知道问题的严重性,直到很晚。

斯坦福公开课 - 经济学课程节选