Alvien Zuhair /110534406871

Penggunaan must dan must not :

1. He must study seriously if he wants to get good marks2. They must complete the work before next week3. She must help her mother clean the house every Sunday4. You must not smoke in this room5. They must not use this room for 3 days6. We must not go home early because we have a lot of work to do

Gambar peringatan :

Description of the picture :

Warning system shows potential for alleviating crashes at dangerous rural intersections