Are these sentences OK?
It's usually less traffic at night.
I don't approve your behaviour. / I don't approve your attitude.
She's probably married by now. / She's already married by now.
No one I know would do something like this.

Question

Are these sentences OK?
It's usually less traffic at night.
I don't approve your behaviour. / I don't approve your attitude.
She's probably married by now. /  She's already married by now.
No one I know would do something like this.

Answer

Hi Sinem,

THERE"S usually less traffic at night.
I don't approve OF your behaviour. / I don't approve OF your attitude.  (APPROVE OF SOMETHING/SOMEONE DOING SOMETHING)
She's probably married by now. / She's already married by now.  BOTH CORRECT, MEANING DIFFERENT
No one I know would do something like this. CORRECT

Answer

They're all technically correct, although one is a little awkward.
Instead of "She's already married by now", I would say, "She's probably already married by now." Although, that is a personal preference and so it really doesn't make a difference.
Long story short, they're all correct, it's just a matter of personal preference.