Make the sentences interrogative and negative
1. Helen can speak French.
2. The pupils may come in.
3.David must write the exercise in his notebook.
4.The children can swim in the swimming pool

1.Can Helen speak French?-Helen can't speak French.2.May the pupils come in?-The pupils may not come in.3.Must David write the exercise in his notebook?-David must not write the exercise in his notebook.4.Can the children swim in the swimming pool?-The children can't swim in the swimming pool.