Must vs. Mustn't

You ___ talk during the exam.

• must

• musn't

You ___ forget to bring your textbook to class.

• mustn't

• must

You ___ be late for the meeting.

• mustn't

• must

He ___ use his phone while driving.

• must

• must not

You ___ pay attention to the teacher.

• musn't

• must

We ___ waste water during a drought.

• mustn't

• must

You ___ disturb others while they are working.

• must not

• must

We _____ obey the laws.

• must not

• must

You ___ ignore safety instructions.

• must

• musn't

He ___ wear a helmet while riding a bike.

• must

• mustn't