Modal verbs

Can, must, should and the bare infinitive that follows them.

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Rules in this topic

A2
Modals + bare infinitive

Modals like will, can, should, must — and semi-modals like would rather, had better — are followed by the base verb (e.g. will go, can buy, would rather stay), not past, third-person -s, or '-ing'.
A2
Verb and modal forms for past time

For ability in the past, use could or could not instead of can or cannot. For a finished action with yesterday, ago or last week, use a past form, not will/shall + verb.
B1
Double Modals

Do not stack modal verbs like 'will can'. Use phrases like 'will be able to'.