A modal verb—can, could, may, might, must, shall, should, will, or would—is used with the base form of a verb to show certainty, necessity, or possibility. Modals do not change form to indicate tense.
Modals and their meanings
The modal verb will requires the base form, meet, not the -s form, meets.
The modal verb could requires the base form, speaks, not the past tense, spoke.
TIP:Do not use to with the base form of the verb following a modal.
The modal verb can should be followed by the base form, drive, not by to plus the base form.
Exercise: Verb forms with modals 1
Exercise: Verb forms with modals 2
Exercise: Using verbs: review
Related topics:
Modals in conditional sentences
to + base form
Modals and other helping verbs