Obligation and Necessity

Obligation and necessity

for 12th grade

less strong than an obligation, and you have another option.

​necessity

something you are expected to do whether you like or not, and no other option.

​obligation

meaning

modal

​must

Formula:
S + must + V₁
Example:
- We must eat before we go.
- All students must participate in study tour.

modal

​Have/has to

Formula:
S + have/has + to + V₁
Example:
- I have to study hard.
- Dara has to finish her work before Sunday.

modal

​should (in future)

Formula:
S + should + V₁
Example:
- You should visit your grandparents.
- I should call my clients soon.

modal

​should (in present)

Formula:
S + should + be + V_ing
Example:
- We should be learning English now.
- She should be cleaning her room right now.

modal

​should (in past)

Formula:
S + should + have + V₃
Example:
- He should have prepared to pack earlier two days ago.
- You should have called me if you need any helps.

- Annabel ought to be here right now.
- The journey ought to take about 2 hours.

​ought to (something happening)

- You ought to listen carefully.
- We ought to leave now.
- Lucy ought to go by herself.

​ought to (obligation)

modal

modal

​had better

1. Advice: It's getting late. You had better go now.

2. Hope: My team had better win tonight.

3. Strong advice: You had better take an umbrella or you will get wet.

modal

​to be + supposed to

1. "it is said": The new John Wick movie is supposed to be excellent.

2. Intended: I'm supposed to shop the supplies on the first of the month.

3. Unfulfilled expectation: Arthur was supposed to visit me last night.

Agung

" you had better study with me or you will regret later." 

Multiple Choice

What is an obligation?

• It is something you have.

• It is something to like.

• It is something you are expected to do.

• It is something you know.

Multiple Choice

What is a necessity?

• It is something less strong than an obligation.

• It is something you have to do strongly.

• It is an unimportant thing.

• It is something good for you.

Multiple Choice

You have another option to do an obligation.

• True

• False

Multiple Choice

The subject of 'have to' is obliged or forced to act by a separate (for example: the law or rules).

• True

• False

Multiple Choice

You can use these modals to express the obligation and necessity, except ....

• should

• have/has to

• must

• may

Fill in the Blank

What ... I ... if my phone doesn't work?

Fill in the Blank

Riko: I am sad because I failed in English test.

Edi: Then you ... ... studied English last night.

Fill in the Blank

Mission Impossible is ... ... be an excellent movie ever.

Fill in the Blank

Arrange the jumbled words into good sentence!

immediately - return - should - book - you - the

Fill in the Blank

Arrange the jumbled words into good sentence!

format - viruses - flash disk - my - I - is - should - full of - because - it