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mustn’t ; must needn’t ; must can’t ; must needn’t ; may
may clean must clean need be cleaned can be cleaned
clean to clean cleaning cleaned
isn’t cleaned didn’t clean doesn’t clean wasn’t cleaned
may clean must clean need be cleaned can be cleaned
isn’t clean didn’t clean doesn’t clean wasn’t cleaned
must clean must be cleaned will clean is cleaned
Must; needn’t; may Must; mustn’t; can Shall; can’t; must Need; mustn’t; may
isn't cleaned didn't clean doesn't clean wasn't cleaned
Not clean Aren’t clean Don’t clean Clean
to clean clean to cleaned cleaning
Must; needn’t; may Must; mustn’t; can. Shall; can’t; must Need; mustn’t; may
may clean must clean need be cleaned can be cleaned
to clean clean cleaned cleaning
Many hands make light work Something is better than nothing The more, the happier The sooner begun, the sooner done
needn’t; may needn’t; must mustn’t; can mustn’t; may
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