Certainty is the state of being definite or completely confident or having no doubt about something. It is the fact that something is certain to happen; something that is clearly established or assured. Uncertainty the state of being unsure or undetermined. It is a state of confusion about the future or upcoming things. Here are the most commonly used expressions for Certainty and Uncertainty.
ASKING FOR CERTAINTY
| Really? |
| Sure? |
| Are you sure? |
| Are you sure about it? |
| Are you sure that…? |
| Are you really sure that…? |
| Are you certain? |
| Confirm? |
| Is it confirmed? |
| Is it true? |
| Is it definite? |
| Was that definite? |
| Do you think it is true? |
| Do you think so? |
| Do you think that…? |
| Do you believe that…? |
| Would you mind if…? |
| How sure are you about…? |
EXPRESSING CERTAINTY
| Sure |
| Confirm |
| Definitely |
| No doubt |
| No doubt about it |
| I have no doubt |
| Of course |
| Why not? |
| Always |
| Absolutely |
| Yes |
| Yes, I’m sure |
| Yes, I’m certain |
| I’m sure that… |
| I’m 100 percent sure |
| That sounds good |
| That sounds perfect |
| Yes, it’s clear |
| It’s clear |
| It’s crystal clear |
EXPRESSING UNCERTAINTY
| I’m not sure |
| I’m not sure about it |
| I’m not really sure about… |
| I’m not sure of it |
| Not sure |
| I’m doubtful |
| I have a doubt |
| I doubt it |
| It’s doubtful |
| It’s dubious |
| I’m not 100 percent sure |
| I have confusion |
| I’m confused |
| I don’t think so |
| But I don’t think so |
| I don’t believe this is true |
| I don’t believe that… |
| I don’t know whether… |
| It’s very unlikely |
| It’s questionable |
| It’s different |
