plenty of can only be used in affirmative statements, not with a negation. So you can say We have plenty of time. But you cannot say We do not have plenty of time.
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Pamela81Does it make sense to say "to proceed with the deal"That might work. I don't know the details of what you're doing together with these people you're writing to. proceed with the work, proceed with the design, proceed with the order. All are possible depending on the situation.