Sé que... I know that...
Creo que... I believe that...
Oigo que... I hear that...
Pienso que... I think that...
Es verdad que... It's true that...
Es cierto que... It's certain that...
Leo que/Leí que... I read/read that...
Oí que... I heard that...
Parece que... It seems that...
Es obvio que... It's obvious that...
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Credit: SCOPE ELOPEs concept from Regents Review Live 2010