Relier Pairs Have to/Has to, Can't/CanVersion en ligne Enlazar la definición con la palabra correspondiente par Alejandra Garcia 1 Can't 2 Can 3 Had to 4 Has to 5 Have to It's use to talk about obligation, things that are necessary to do. Also you only use it with first and second person (I, you, we, they) It is used to express that someone doesn't have the ability or to say that something is not possible. You use it with all the subjects It's use to talk about obligation, things that are necessary to do. It's used for the past tense and you use it with all the subjects It's use to talk about obligation, things that are necessary to do. Also you only use it with third person (he, she, it) It is used to express ability or to say that something is possible. You use it with all subject (I, you, she, he, it we, they)