MUST and HAVE TO Modals, express a strong obligation or prohibition "Must" and "Have to": modals verbs, both express obligation. "Have to" is a more flexible form. Alternative: "have to",…

To be able to do something "to be able to" is used for ability for all tenses instead can or could. "to be able to": You are capable to do…

COULD HAVE Remember: COULD is a modal verb (called "modal"). Modals are used before ordinary verbs. COULD is used for Ability, Past form of CAN, with senses verbs, action not…

COULD – MODAL VERB Uses : Ability, Past form of CAN, with senses verbs, action not realistic, polite request, "COULD" can be used to talk about the past, the present…

CAN and HAVE CAN (modal) + HAVE Remember: CAN is a modal verb (called "modal"). A modal is used before ordinary verbs. CAN is used to express meanings such as…