it's no good 是加动词ing形式还是加to do sth.

it's no good 是加动词ing形式还是加to do sth. difficult是加动词ing?还是加to do sth. It 's no pleasure doing这个句型,为什么动词要用ing形式呢?为什么不用to do sth. it looks like doing sth为什么加动词ing形式 It's time to do sth是固定用time to do sth,还是说名词加to 加do sth 有个这样的 to什么时候加do什么时候加动词ing形式? why not 是加to do sth. 还是 动词原形 be going to 加动词ing 还是动词加S? It's time for后面加动词原形还是动词ing形式? good at后面加动词原形还是ING形式 do you后面是加动词原形还是加ing形式? It's no pleasure 后面加doing 还是to do