What does it mean?
Use have to, must, and need to for obligation or necessity. Use mustn't for prohibition. Use don't have to and don't need to when something is not necessary.
I have to study.
You mustn't run here.
We need to listen.
You don't have to pay.
Ask: necessary, forbidden, or optional?
NecessaryI have to wear a seat belt.I must do it.
ForbiddenYou mustn't touch the wire.Do not do it.
Not necessaryYou don't have to bring lunch.You may, but it is optional.
Use have to for rules and duties.
I have to do homework.It is my duty.Obligation.
She has to wear a uniform.It is a rule.Use has to with he/she/it.
Do we have to wait?Asking about a rule.Question form.
Use must for strong obligation and mustn't for prohibition.
You must listen.It is very important.Strong rule.
You mustn't shout.It is forbidden.Do not do it.
She must be careful.Strong advice or rule.Must + base verb.
Clue words can help.
Obligation cluesrule, duty, school, law, importantUse have to, must, or need to.
Prohibition cluesdanger, forbidden, do not, noUse mustn't.
Optional cluesnot necessary, optional, already doneUse don't have to / don't need to.
Have to forms.
AffirmativeI have to go.
She has to study.have/has to + base verb
She has to study.have/has to + base verb
NegativeI don't have to go.
He doesn't have to study.not necessary
He doesn't have to study.not necessary
QuestionDo you have to go?
Does she have to study?Do/Does + subject + have to?
Does she have to study?Do/Does + subject + have to?
Need to forms.
NecessaryI need to practise.
They need to hurry.need to + base verb
They need to hurry.need to + base verb
Not necessaryI don't need to wait.
She doesn't need to come.optional / not required
She doesn't need to come.optional / not required
QuestionDo we need to bring books?
Does he need to call?Do/Does + subject + need to?
Does he need to call?Do/Does + subject + need to?
Same idea, different strength.
I have to wear a uniform.It is a rule or duty.External rule.
I must wear a helmet.Very strong rule or personal feeling.Strong obligation.
I don't have to wear boots.It is not necessary.Optional.
Do not confuse mustn't and don't have to.
Mustn'tYou mustn't run in the lab.It is forbidden.
Don't have toYou don't have to run.It is not necessary.
Not correctShe musts go.
He doesn't has to go.Use base verb forms.
He doesn't has to go.Use base verb forms.
Choose the correct form.
We ___ a uniform at school.
Choose the correct form.
That wire is dangerous. You ___ it.
Choose the correct question.
___ we have to bring our books?
Which sentence means it is not necessary?
Choose the best sentence.
Which sentence shows necessity?
Choose the best sentence.
Fill five blanks.
Choose the correct form. Think about obligation, prohibition, necessity, or no necessity.
Students on time.
You in the hospital.
Lunch is provided. You food.
It is very hot. We water.
Maha finished early. She tomorrow.
Mixed question types of 5
Answer all five. Then tap Finish test to see your result sheet.
1. Sentence completion
Sara ___ for the test.
2. MCQ
Which sentence shows prohibition?
3. Type the answer
You ___ have to come early. It is optional.
4. Type the answer
We ___ practise before the show.
5. MCQ
Which question is correct?
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