I can do it...

[anıl]

Test No. incompl/inter-73 "Modal Medley", question 1

I know I ......... do it because I have done it before.

(a) ought
(b) must
(c) can

Test No. incompl/inter-73 "Modal Medley", answer 1

I know I can do it because I have done it before.

Correct answer: (c) can

Your answer was: incorrect
I know I must do it because I have done it before.
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how

[Alan]

Hi,

You need can here because the rest of the sentence shows that you 'have done it before', which means that you have been able to do it before.

Alan
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English as a Second Language
You can read my ESL story Present Simple

[Nabilchamlal]

hi,

The good sense must tell us if you are challenged and you did it but nobody believes you, I think must is the only word can direct your purpose.

[Beeesneees]

See Alan's response. You cannot change the meaning to suit your desire to play with words.
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Cheers m' dears!