do you have anything .you want to say for yourself.用 that which waht how用哪个?
问题描述：
do you have anything .you want to say for yourself
.用 that which waht how用哪个?
答
如果表达的时候可以不加的，加的话就用that.
答
that 没什么好解释的，就是that
答
that anything nothing 等出现一定用that