1-Need

Need is used for necessity.

Examples :

  • In summer we need to drink water more often.
  • We nneed to eat in order to survive.

Don’t need to:

Not to do something, because there is no need for it.

Examples :

  • I don’t need to take my passport, ID card is accepted.
  • You
  • You don’t need to enter the code before 6 pm.

Needn’t have :

For something was done but turned out to be unnecessary.

Examples :

  • I needn’t have taken warm clothes, it was hot.
  • He needn’t have worn a tie. It was a casual event.

2- Must

An obligation or rule.

Examples :

  • Pupils must wear a uniform. It’s a rule.
  • Seat belts must be worn by all passengers.

Must

For deduction when we are certain that something is true.

Example:

  • John hasn’t eaten anything today, he must be hungry.

Mustn’t

Obligation not to do something.

Examples :

  • Students mustn’t talk during the exam.
  • You mustn’t tell Mom about the gift, it is a surprise.

3- Have to

An obligation from an external source.

Examples :

  • Lisa has to wear a uniform, the rule says so.
  • He has to exercise more, the doctor says so.

Note: have to has the same meaning of have got to. But have got to is more informal.

  • She has got to take the car to the garage today.

Don’t have to

No necessity to do something.

Examples :

  • We don’t have to take notes, we will get a summary.
  • Men don’t have to wear a tie, but they can wear one if they like.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s