have to / don't have to We always use the base form of the verb after have to / don't have to. ✓ He has to tidy his room today. X He has to tidied his room today. X He has to tidying his room today. We use the correct form of do + not/n't + have to to say that something isn't necessary. We don't use haven't to. ✓ You don't have to help me. I can do it. X You haven't to help me. I can do it. Find six mistakes. Correct them. I have to do a lot of housework at home, but I'm OK about that. I have to tidying my room, but I haven't to vacuum the floor. My brother has to does that. We have to do the washing up, but we don't have do the washing. My dad does that once a week. I haven't to do the cooking - my mum likes cooking. She says it helps her to relax. Of course, I have to doing my homework every day after school. I'm not OK about that!​