must have=duty

English grammar help. Grammar questions from ESL learners

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navi
Gold Member
Posts: 486
Joined: Thu Feb 12, 2004 1:19 pm

must have=duty

Postby navi » Mon Jan 23, 2012 11:22 pm

Can one say:
1-He must have finished it yesterday.
instead of:
a-It was his duty to finish it yesterday.

Can one say:
2-He must have finished it by now.
instead of:
b-It was his duty to have finished it by now.

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Alan
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Re: must have=duty

Postby Alan » Wed Jan 25, 2012 3:14 am

No!


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