Modals of obligations

*ADVICE as are: You should / You shouldn´t... (stronger)
You must / You musn´t... (very stronger)
Examples: You should talk to our accounts manager - she can help you.
You musn´t leave London without visiting the Tower!


*PERSONAL RULE as are: Must / musn´t
Example: I must try to get to work earlier.


*GENERAL RULE as are: Have to
Example: Do you have to have a visa to travel to Russia?


*NECESSARY as are: Need to
Example: We need to plan our next sales conference soon.


*NOT NECESSARY as are: Don´t have to / don´t need to
Examples: You don´t have to have a visa for the UK.
You don´t need to write a letter - you can phone.


*NOT ALLOWED as is: Musn´t
Example: You musn´t leave your car in front of the hotel - it´s a no parking area!