1. He failed (persuade) to persuade his boss to accept his project.
2. Trees (grow) grow more quickly in summer than in winter.
3. You (ever/ see) have you ever seen this film before?
4. Mary (not/ have) doesn't have much money. She can’t afford (go) going out very often.
5. I (already/ hear) have already about the accident when he (tell) heard me about it.
6. The police didn’t allow the tourists (camp) to camp in this wood for security reasons.