这个句子正确吗?If i know something that I cannot tell anyone

问题描述:

这个句子正确吗?If i know something that I cannot tell anyone
If i know something that I cannot tell anyone 这句里用know还是用knew?
为什么?这个不是假设句子吗?

If i know something that I cannot tell anyone
这不是假设句
是如果我知道.
如果是假设句,那就
if i had known sth .
假如我知道.