He doesn't grants us a 3\% discount for cash payment.
You don't should have called your friend long ago.
He doesn't knew what was wrong with the machine.
The manager doesn't will be able to receive to Mr. A. only in the afternoon.
I don'r had to sign this agreement only on Monday.
They doesn't have to transport their products by rail.
Participation in fairs doesn't helps promote our goods.
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Do homework everyday
Don't late
Don't skip the lessons
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