1.
I'm sure William hasn't lied to you.
William hasn't been lying to you.
2. I don't really want to go to the party.
I feel I don't want to go to the party.
3. It's possible that we won't meet again.
We will not meet again.
4. Please keep your voice down.
Would you mind keeping your voice down?
5. There's no need to return his phone call.
There's no point to return his phone call.
6. It is difficult for her to speak in public.
She has difficulties speaking in public.
