I left out the following sentences. Thank you, Writeacher.
1) You mustn't leave the school building without either your teacher's or your parents' permission.
2) You shouldn't revise for a test just the day before (the test). You shouldn't run in the corridor or raise your voice in class /during lessons/during school hours. (all possible?)
3) We don't have to come back to school in the afternoon.
4) You should make sandwiches and take them to school instead of buying a snack from the vending machines or at the school cafè/canteen.
1. OK
2. Delete "revise" and insert "review" -- all else is fine.
3. OK
4. OK
1) The sentence is using the modal verb "mustn't" to indicate a prohibition. It states that it is not allowed to leave the school building without permission from either your teacher or your parents. To figure out the answer, you can identify the key words or phrases in the sentence such as "mustn't" and "permission." By understanding the meaning of these words, you can grasp the overall message of the sentence.
2) This sentence is giving advice using the modal verb "shouldn't." It suggests that it is not advisable to revise for a test on the day before the test. Additionally, it advises against running in the corridor or raising your voice in class, specifically during lessons or throughout school hours. To understand the sentence, you can identify the modal verb "shouldn't" and the actions being described, such as revising, running, and raising voices.
3) In this sentence, the modal verb "don't have to" is used to indicate the absence of obligation. It states that it is not necessary to come back to school in the afternoon. To understand the sentence, focus on the phrase "don't have to" and the action of coming back to school in the afternoon.
4) This sentence offers a suggestion using the modal verb "should." It recommends making sandwiches and bringing them to school instead of buying a snack from vending machines or the school café/canteen. To understand the sentence, you can identify the modal verb "should," the action of making sandwiches, and the alternative action of buying a snack.