我说啦~意思不一样,肯定有上下文的,要不然,它们怎么会说有一个对一个不对?
不过,要较真的话：don't konw how to do about it
其实说成：don't konw how to do it,就行了,其实不用较真啦~
don't konw what to do about it
don't konw how to do about it
都对,意思不一样.
don't konw what to do about it——不知道关于它,（我）能做些什么.
don't konw how to do about it——不知道关于这件事,（我）应该怎么做.