Being sure / certain

Sometimes we know that we are right about something. When we feel confident of our facts, we show other people how certain we are by using one of the following ten phrases.

10 expressions to Use In Speaking And Writing: 
  1. I'm quite sure...
  2. I'm absolutely positive...
  3. I'm fairly / quite certain...
  4. It must be right.
  5. I know...
  6. It's definitely...
  7. You can be sure...
  8. I've no doubt at all that...
  9. I'm a hundred percent certain that...
  10. I'm (utterly) convinced...
How To Use These Phrases In Your English: 
  1. All phrases are followed by a sentence or clause.
  2. Phrases 1, 2, and 3 are very strong and show that you really are certain.
  3. Phrase 4 is a little less strong than the others. There is just a little doubt in the speaker's mind.
  4. Phrases 7 and 8 are used especially for reassuring other people who don't believe.
  5. Phrases 9 and 10 are saying that there is no doubt at all. What you are saying is a fact.
Intermediate