A Change using may, must, can, have to, should. Use not if necessary 1. It is necessary to learn this rule as the teacher told us. You
2. We are not aldvised to swim in cold water. We
3. She is not able to read Chinese. She
4. Am I allowed to ask a question?... I ?
5 It is obligatory to work on Saturdays even if you don't want to. You