20. fill in have to/has to, don't / doesn’t have to, etc 1. buy any milk. her sister melody has already bought it. 2. i don’t have a pencil. ask somebody for a pencil. 3. nick is studying literature. read a lot of books. 4. the poem by heart? no, i know it. 5. clean the blackboard. tim has already cleaned it.
2.Have to
3.Has to
4.Do you have to learn
5.Don't have to