Must and Must not is a popular keyword and we did our best to create this YT video around this keyword
When to use Must
- We use must: to express the idea that something is necessary or very important.
- With must, the speaker is expressing a personal opinion or authority.
- Must is used in written instructions and orders.
- We also use must in: Obligation, Prohibition, Strong advice, and Deductions.
When to use Must not
Must not = mustn’t.
Mustn’t is a negative obligation, it is important that you don’t do something.
Must and Must not Form
Subject + must or must not + base verb + complement.
The main verb is used without, “to”, “s”, and ing.
- He must work hard to pass. (correct)
- He must works hard to pass. (incorrect)
- We must go home. (correct)
- We must to go home. (incorrect)
- You must respect your parents. (correct)
- You must respecting your parents. (incorrect)
Examples of Had to
- I was very hungry yesterday, I had to eat something.
- We had to walk home last night, there were no buses.
Must and Must not Examples
- You must not smoke.
- You must not drink wine.
- It’s late, we must go now.
- We mustn’t shout in class.
- We mustn’t miss our plane.
- We mustn’t cheat in an exam.
- We mustn’t park in this street.
- I mustn’t forget to call my wife.
- We must finish this work today.
- You must finish your homework.
- I must apologize for arriving late.
- You must not be late for the exam.
- It’s a fantastic film, you must see it.
- We mustn’t leave the meeting early.
- I’m very hungry. I must eat something.
- My hands are dirty, I must wash them.
- Students must not talk during the exam.
- Plants must have light and water to grow.
- We must respect our parents and teachers.
- Your wife must serve you and your children.
- We must not be late, we must come on time.
- You must take this medicine three times a day.
- I must get up early tomorrow, I have a lot to do.
- You must watch this lesson, it’s really important.
- The windows are very dirty, we must clean them.
- You must not use your phone while you are driving.
- I mustn’t forget to tell John, he wants to come, too.
- You mustn’t bring your mobile phone into the exam.
- We mustn’t lose our tickets, we can’t get any more.
- Sally is a very interesting person, you must meet her.
- Keep these papers in a safe place, you mustn’t loss them.
- We must not forget to turn off the lights before we leave.
- You mustn’t throw things in the science lab! It’s dangerous!
- You mustn’t get the number 6 bus, it doesn’t stop at the station.
- I forgot to phone David yesterday, I must phone him later today.
- You must study before the exam if you want to get a good result.
- I don’t want Susan to know what happened, you mustn’t tell her.
- We must check the times of the trains again. I’m not sure of them.
- It’s my daughter’s birthday next week, I must not forget to buy her a present.