Mustn’t and needn’t are not the same.

I mustn’t eat so much food. I needn’t use the steps.
We use mustn’t when something should not be done.
• I mustn’t forget to do my homework.
(Remember to do my homework)
• You mustn’t walk on the road.
(Do not walk on the road)
We use needn’t when you have a choice to do something or not.
• I needn’t do my homework tonight because the lesson is next week.
(You can do your homework, or not. Your choice)
• You needn’t bring some water because I have some.
(You can bring water, or not. Your choice)
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Remember: Mustn’t is no, no, no. Needn’t is your choice.
Complete each sentence with either mustn’t or needn’t.
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Remember: Mustn’t is no, no, no. Needn’t is your choice.
Complete each sentence with either mustn’t or needn’t.
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Question 1 of 6
1. Question
I ___ take the umbrella. It won’t rain.- I (needn't) take the umbrella. It won’t rain.
Correct
I needn’t take the umbrella. It won’t rain.
Incorrect
I needn’t take the umbrella. It won’t rain.
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Question 2 of 6
2. Question
You ___ come if you don’t want to.- You (needn't) come if you don’t want to.
Correct
You needn’t come if you don’t want to.
Incorrect
You needn’t come if you don’t want to.
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Question 3 of 6
3. Question
You ___ smoke in here. It’s not allowed.- You (mustn't) smoke in here. It’s not allowed.
Correct
You mustn’t smoke in here. It’s not allowed.
Incorrect
You mustn’t smoke in here. It’s not allowed.
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Question 4 of 6
4. Question
We ___ be late. The train leaves at 13.42.- We (mustn't) be late. The train leaves at 13.42.
Correct
We mustn’t be late. The train leaves at 13.42.
Incorrect
We mustn’t be late. The train leaves at 13.42.
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Question 5 of 6
5. Question
This is very important. You ___ forget what I said.- This is very important. You (mustn't) forget what I said.
Correct
This is very important. You mustn’t forget what I said.
Incorrect
This is very important. You mustn’t forget what I said.
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Question 6 of 6
6. Question
Gary sent me an e-mail. I ___ forget to reply to it.- Gary sent me an e-mail. I (mustn't) forget to reply to it.
Correct
Gary sent me an e-mail. I mustn’t forget to reply to it.
Incorrect
Gary sent me an e-mail. I mustn’t forget to reply to it.
Complete each sentence with either mustn’t or needn’t.
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Complete each sentence with either mustn’t or needn’t.You have already completed the quiz before. Hence you can not start it again.
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Question 1 of 6
1. Question
You ___ wash the dishes. I can do them later.- You (needn't) wash the dishes. I can do them later.
Correct
You needn’t wash the dishes. I can do them later.
Incorrect
You needn’t wash the dishes. I can do them later.
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Question 2 of 6
2. Question
We have a lot of time. We ___ run.- We have a lot of time. We (needn't) run.
Correct
We have a lot of time. We needn’t run.
Incorrect
We have a lot of time. We needn’t run.
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Question 3 of 6
3. Question
Keep these documents in a safe place. You ___ lose them.- Keep these documents in a safe place. You (mustn't) loose them.
Correct
Keep these documents in a safe place. You mustn’t lose them.
Incorrect
Keep these documents in a safe place. You mustn’t lose them.
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Question 4 of 6
4. Question
We ___ forget to put the cat out before we go to bed.- We (mustn't) forget to put the cat out before we go to bed.
Correct
We mustn’t forget to put the cat out before we go to bed.
Incorrect
We mustn’t forget to put the cat out before we go to bed.
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Question 5 of 6
5. Question
You ___ wait for me. I can get there by myself.- You (needn't) wait for me. I can get there by myself.
Correct
You needn’t wait for me. I can get there by myself.
Incorrect
You needn’t wait for me. I can get there by myself.
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Question 6 of 6
6. Question
I ___ cut the grass today. I can do it at the weekend.- I (needn't) cut the grass today. I can do it at the weekend.
Correct
I needn’t cut the grass today. I can do it at the weekend.
Incorrect
I needn’t cut the grass today. I can do it at the weekend.
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Remember: Mustn’t is no, no, no. Needn’t is your choice.
You mustn’t eat before opening.
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Have to or must?
Have to is your wife’s choice. Must is your choice. (3:15)Vocabulary Video Lesson: Fear
This vocabulary lesson will help you define fear, phobia, panic, dread, mania, cold sweat, daunting, irrational and petrified. (8:00)