I think so
I believe that is the case, but am not certain.
Antonym: I don't think so
I think so long as fossil fuels are cheap, people will use them and it will postpone a movement towards new technologies. Paul Krugman
Name any name and then remember everybody you ever knew who bore that name. Are they all alike. I think so. Gertrude Stein
All the actors I respect, especially old-Hollywood actors, the reason I think so many of them have had long careers is that there is a sort of mystery about them. You don't know what they do on Friday nights when they go home from work. You have no clue. You have this sort of fantasy about them. Kate Mara
I think so much depends on what happens in the next six months. If the president is determined to go ahead with this plan, and he appears to be determined, I hope it works-for our country, for Iraq, for our soldiers. I hope that I prove to be as wrong as I've ever been in my life. Susan Collins
Our fellow passenger was Major Grogan, who thirty years before had been the first white man to go from the Cape to Cairo. It took him three years, one whole year in the marshes of the Sudd; his two companions died. It is said he ate them; I think so. He looked like a sensible man. James Tiptree, Jr
The whole question of God and what God is, and whether it's a blond guy with a beard, I don't know... I don't know that. Do I believe that there's something greater at work than the sum of humanity? Yeah, I think so. Anthony LaPaglia