Modal verb Use to... can Talk about a skill or possibility in the present, or to ask for permission could Talk about a skill or possibility in the past or the future, or to ask for something politely may Talk about a possibility in the future or the present, or to ask for something politely might Talk about a possibility in the future or the present, or to ask for something politely will Talk about something that will be done in the future shall Talk about something that will be done in the future should Talk about an obligation or a recommendation ought to Talk about an obligation or a recommendation must To talk about an obligation, a prohibition or a need would Speak of a preference or a custom in the past, or to ask something politely Can "Can" indicates skill or ability. In these cases it can be translated as "power" in Spanish. Examples: I can speak five languages. (I can speak...