[Cool_China]

作者: Bennie

1) As I know, "go" can not be a copular verb. Here I think "get" or "become" will be a better choice. And if you use it as an adj., "smoother" is better than "much more".
But......after checking the dictionary, sometimes you can use smooth as smoothly. ~_~!

2) Agree.

3) I think "It's" is not equal to "It was".

4) I still prefer "their mouths", or "each one's mouth". ^_^!

You'd better study now.
You had better study now

Two sentences are equal.