Modal Verbs: could

Modal Verbs: could

Could can be used with the indefinite infinitive to express past actions. When using could in this way, it usually indicates ability or possibility in the past.

Modal Verbs: can

Modal Verbs: can

Can is a modal verb that can be used to indicate ability, permission, or possibility. Here's how it can be used in different tenses and forms: present, future, indefinite passive, indefinite infinitive