4. Do it carefully or you'll feel sorry afterwards. -> If.................................................................. 5. Ask him first or he won't offer to help. -> If................................................................... 6. Be calm or you'll make a wrong decision. -> Unless............................................................ 7. Be careful or you'll cut yourself with that knife. -> If......................................................................

4. If you don't do it carefully, you'll feel sorry afterwards.
5. If you don't ask him first, he won't offer to help.
6. Unless you are calm, you'll make a wrong decision.
7. If you are not careful, you'll cut yourself with that knife.