how about doing sth. It‘s adj. to do sth
How/What about doing sth.
It's time to do sth.
例: It's time to go home. 该回家了.
It's time to do my homework. 该写功课了.
It's + adj.+to do sth.
例: It's good to doing exercise everyday. 每天做运动是好的.
it is +adj. +to do sth.
it's time to do sth
还是表建议用的it's high time that we should do sth