Hes not sure (about something in the context). He expects that he may be sure about it at some future time, possibly soon. Maybe he is still investigating the situation and trying to find the answer. 16th July 2018.
Is I dont know and Im not sure the same?
I dont know is definite and informal. When is the next bus coming? I dont know. Im not sure is more appropriate when answering questions to people you dont know or are superior to you. Its more polite. It could also mean that you have an approximate answer, but it may not be correct.
How do you answer do I know you question?
The most common answer to whats up is “I am fine, thank you, what about you?” The person who is asking this is enquiring about your well being at that very moment.
How do you say I dont know in a polite way?
Try one of these instead:Im not sure, but Ill find out and let you know.Ill find out.Ill look into it and get back to you with what I find.Thats a good question and I want to get you the right information. Let me get back to you by end-of-day.Sep 18, 2019