有it is a waste of time doing sth 这种用法吗?

有it is a waste of time doing sth 这种用法吗? It's a waste of time doing sth. it is a waste of time doing接SB怎么接 it is no wonder to do sth接 it is a waste of time doing还是to do It is a waste of time doing this这里为什么用doing而不用do?为什么? It is only a waste of time 有没有waste time doing sth. it help a lot in doing sth有这种用法吗 请问,It is a waste of time 后该用to do 还是 doing 适当形式填空Stop doing that!It is a waste of time and ____________ a waste of time后面是加 doing sth还是to do sth 有want doing sth这种用法吗