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接SB怎么接 it is no wonder to do sth接 it is a waste of time doing还是to do sb.spends some time doing sth.it is+adj.+for sb.to do sth.it 请问,It is a waste of time 后该用to do 还是 doing it is a waste of time to do 这个句子 有it is a waste of time doing sth 这种用法吗? It is a waste of time doing this这里为什么用doing而不用do?为什么? it is adj.of sb.to do sth.it is adj.from sb.to do sth. they think it is a waste of time to do it now能不能改成they think it is time for sth.与it is time (for sb.) to do sth.区别 It's a waste of time doing sth. it is no use doing sth.与it is no use to do sth.的区别