Example:
I'd be happy to help if I can.
If I can help, I'd be happy to.
I wonder if you can help me.
I wonder if you can help me?
If I may say something. ...
I think ...
What if she forgets to bring it?
What happens if she forgets to bring it?
What if I say no? She asked boldly.
"Then I say no?" She said tentatively.