Obligation / Possibility / Necessity / Advice

Learn which modal or phrase to use, and why.

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Topic

What do they mean?

Some words tell us something is required. Some tell us something is possible. Some tell us something is necessary. Some give advice. The meaning decides the form.

You must stop.
It might rain.
We need to hurry.
You should rest.
Big idea

Ask: what does the speaker mean?

ObligationYou must wear a helmet.It is required.
PossibilityIt may snow tonight.Maybe it will happen.
AdviceYou should practise.It is a good idea.
Obligation

Use must or have to for obligation.

MustYou must listen carefully.Strong rule or strong feeling.
Have toWe have to wear uniforms.Rule, duty, or outside requirement.
Mustn'tYou mustn't touch the wire.It is forbidden.
Possibility

Use may, might, or can for possibility.

MayIt may rain later.Possible.
MightIt might rain later.Possible, but less sure.
CanAccidents can happen.General possibility.
Necessity

Clue words can help.

Need toWe need to drink water.Necessary.
Don't need toYou don't need to wait.Not necessary.
Have toI have to finish this.Necessary because of a duty.
Form reminder

Use should or shouldn't for advice.

ShouldYou should sleep early.Good idea.
Shouldn'tYou shouldn't shout.Bad idea.
QuestionShould I call her?Asking for advice.
Form reminder

Negative forms change the meaning.

Mustn'tYou mustn't enter.Forbidden.
Don't have toYou don't have to enter.Not necessary.
Shouldn'tYou shouldn't enter.Advice not to do it.
Compare

Compare the strength.

StrongYou must stop.Rule or danger.
NecessaryYou need to stop.It is needed.
AdviceYou should stop.It is a good idea.
Common mistake

Common mistakes.

CorrectShe must go.
He should rest.Base verb after modals.
Not correctShe musts go.
He should to rest.No -s. No to.
CarefulMustn't is not the same as don't have to.Forbidden vs not necessary.
Sentence completion 1

Choose the correct form.

At this school, students ___ a uniform.

Sentence completion 2

Choose the correct form.

Take an umbrella. It ___ later.

Sentence completion 3

Choose the correct form.

We ___ drink water every day.

MCQ 1

Which sentence is correct?

Choose the best sentence.

MCQ 2

Which sentence means not necessary?

Choose the best sentence.

Paragraph completion 1

Fill five blanks.

Choose the correct form. Think about meaning: rule, maybe, needed, or good idea.

The glass is broken. You it.
I am not sure, but Huda at home.
The project is due today. We it.
You hurt his feelings. You sorry.
The meeting is optional. You .
Test 1

Mixed question types of 5

Answer all five. Then tap Finish test to see your result sheet.

1. Sentence completion

We ___ quiet in the library. It is a rule.

2. MCQ

Which sentence shows possibility?

3. Type the answer

Plants ___ water to grow.

4. Type the answer

You ___ ask for help if you are confused.

5. MCQ

Which sentence means forbidden?

Cumulative result sheet

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