900 Crazy English (Basic) – Unit 15

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    Lesson 15. CERTAINTY AND UNCERTAINTY.
    211 To be honest, I’m not certain.
    212 Maybe.
    213 I couldn’t say for sure.
    214 I couldn’t say for definite.
    215 I couldn’t say absolutely.
    216 I’m positive that he did it.
    217 I’m certain of it.
    218 I’m not sure that’s a good idea.
    219 I can’t be certain of what time I left the office.
    220 I’ve no idea where my shoes are.
    221 I’m not certain if he’s telling the truth.
    222 Are you certain this is what you want to do?
    223 I swear this is the truth.
    224 I have no doubt about how I feel.
    225 Absolutely.