To express and respond to doubt.
Expressing doubt.
-I'm afraid I'm not sure.
-Soryy, I'm not sure about it.
-I'm doubtful.
-I doubt it.
-I'm not really sure that he told me the truth.
Responding to doubt.
-Please don't worry.
-Everything will be fine.
-Don't worry too much. Next time will be better.
-I think you need not worry about it.
Expressing doubt.
-I'm afraid I'm not sure.
-Soryy, I'm not sure about it.
-I'm doubtful.
-I doubt it.
-I'm not really sure that he told me the truth.
Responding to doubt.
-Please don't worry.
-Everything will be fine.
-Don't worry too much. Next time will be better.
-I think you need not worry about it.
