can,have to,should
Modal verbs are always followed by the infinitive without to.
2.Meaning
It is permitted/allowed
It is prohibited/not allowed
It is necessary.
It is not necessary/ you can choose.
It is a good idea to do something/recommended.
It is not a good idea to do something / not recommended.
3.Examples
In the UK
you can buy alcohol if you are over 18.
You can't leave school until you are 16.
you have to wear a seatbelt in the front of a car
you don't have to have an ID card.
you should tip taxi drivers and waiters.
you shouldn't leave your umbrella at home
4.Question
In the U.S.
can you buy alcohol if you are 17
Do you have to wear a seatbelt in the front of a car
Should you tip taxi drivers
Question forms:
with modal verbs, invert the modal verbs and the subject.
Have to is a normal present simple verb. Use do/does + subject + have to+ infinitive without to
Can women drive in Saudi Arabia?
Should you bow when you meet someone when traveling in Asia
In what countries do you have to haggle
Comparative structures
THE SAME,DIFFERENT
the same as
very like
pretty similar to
slightly different from
completely different from