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B1 GRAMMAR · MODALS · B1
Modal verbs: ability, advice and obligation
Modals like can, must and should add meaning to a main verb — ability, permission, advice or obligation. They never take -s and are always followed by the base verb.
See the difference
A
must
strong obligation from the speaker
You must wear a helmet.
你必须戴头盔。
B
should
advice or a recommendation
You should see a doctor.
你应该去看医生。
Practise it
Q1 You ____ smoke here — it’s a hospital.
Q2 She ____ speak three languages.
Q3 You look tired. You ____ rest.