be unaware of后可以接名词、动名词以及what、how、where等引导的从句。因为of是介词。意思是“不知道”“没有意识到”。例如：
I was unaware of his existence until now.现在我才知道有他这麽个人。
He was unaware of his mistakes.他没有意识到自己的错误。
You seem to be unaware of how urgent thesituation is. 你好像没有意识到形势是多么的急迫。
be unaware of后面加什么
可以用not know或者not realize来替换 分析：be unaware of，意思是“不知道没意识到”
1.What I was unaware of was that she had breast cancer. 我那时不知道的是她得了乳腺癌。 可以替换成：What I didn't know was that she had breast cancer. 2.He may be unaware of his rudeness. 他有可能没意识到他的粗鲁。
He may not realize his rudeness.
