| A | B |
| Dudo que... | I doubt that. . . |
| Es increíble que... | It's unbelievable that . . . |
| No creo que... | I don't believe that . . . |
| No estoy seguro(a) que... | I'm not sure that . . . |
| No puedo creer que... | I can't believe that . . . |
| Parece mentira que... | It's hard to believe that . . . |
| Claro que... | Of course . . . |
| Es cierto que... | It's true that . . . |
| Es evidente que... | It's evident that . . . |
| Es obvio que... | It's obvious that . . . |
| Estoy convencido(a) que... | I'm convinced that . . . |
| Estoy seguro(a) que... | I'm certain that . . . |
| No cabe la menor duda. | There is absolutely no doubt. |
| Por cierto. | Certainly. |
| Por supuesto. | Of course. |
| Sin duda alguna. | Without a doubt. |
| Todo el mundo sabe que... | Everyone knows that . . . |