Thanks you all,but i can not choose two answers ...

Thanks you all,but i can not choose two answers ...
Thanks you all,but i can not choose two answers at the same time so i want to say sorry for you.
但我不能同时选择两个答案,所以我想对你们说一声对不起.
我上面用的英语 有没有语法的错误?
我在书上看见有这么一句：
I know you all.
这句可以换成这样的吧？I know all of you.
所以我就想 Thanks you all.可不可以等价于 Thanks (to) all of you.(不加to可以吧？