can
Tariq can lift the case. · ability
Masterminds · English Grammar
Modals
Choose Meaning Before Formality
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could
Could you send the updated map? · polite/tentative request
should
You should check the serial number. · advice
may
Visitors may use this entrance. · permission
might
The convoy might arrive late. · possibility
must
Visitors must show identification. · obligation
must
The office is dark; they must be gone. · deduction from evidence
Read the situation; name the function; then choose the modal and base verb.
El mismo modal puede tener más de una función; usa el contexto.