Make the sentences interrogative and negative 1. Helen can speak French. 2. The pupils may come in. 3.David must write

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