1
It is used to give an advice. Reflect an opinion of what is right. It translates as the conditional "deberia" in Spanish.
2
It is used when the issuer doesn't impose any obligation, just informs an obligation existing. It uses in past, present or future time.
3
It is used to indicate possibilities in the present or the future. It is a synonymous of "May".
4
It is used to indicate future action, also frequently used in promises or voluntary actions. It's more polite than will and it's very common it use in U.K
5
It is used with promises or voluntary actions that take place in the future, It can also be used to make predictions about the future.
6
It is used to request or offer and in "if" sentences.
7
It is used to express ability or possibility in the past and future. In interrogative sentences requests permission or inquire about the possibilities and it's formal
8
It is used to express obligation, prohibition or neccesity, also you can use it to assume something. It uses with the present and future time, the issuer imposes an obligation.
9
It is used to express ability or possibility. In these cases it can be translated like "poder" in Spanish
10
It is used to express possibilities in the future, also to give permissions or instructions. In interrogative sentences it use is very polite.
