Hello, sixth year. There we go...
Modals are
auxiliaries that can be used to modify the meaning of the following
verb. Different modals can express the same notion, while one specific modal can have different meanings. For example, CAN.
You use CAN to express possibility, permission or ability. What shall tell you is the context. Check!
You
CAN drive, because you are eighteen. - that means you are authorized to drive.
You
CAN drive on the right - that means you have the permission to drive.
You
CAN drive well! - that means you have the ability to drive.
We shall work only with the 3 below:
You should study. = advice
You must study. = obligation
You can study. = permission
Structure:Affirmative:
S M VI can driveNegative:
S M + not VI can not driveInterrogative:
M S VCan I drive?