I think that I'm seeing the dentist.... is the correct answere
i think both option1 and option2 are right
I am going to see the dentist tomorrow at 3
Why will you think that person is looking at somebody but not the dentist?Not quite. If I would hear somebody say "I think that I'm seeing the dentist" I would think that person is looking at somebody and is not sure if that person is the dentist (who would have been mentioned previously).
For starters, "I think that I'm seeing the dentist" is not one of the options. Also, if you think you are seeing something you are not sure what it is you are looking at.
(It may be about time to close this thread.)
I gonna see the dendist tomorrow...
hehe, I dont think i need to vote, 'cause i never have an appointment