MUST: High Certainty & Deductions (95% - 100%)
We use MUST when there is clear observable evidence or undeniable logic. You are 95% to 100% sure that something is true.
Observable clues right now in front of you:
When scheduled plans or intensive preparation make an outcome virtually certain:
Watch out for these common student traps:
MAY: Realistic Possibility & Permission (~50%)
We use MAY when an event has a realistic, balanced chance (~50% possibility) or to request/give formal permission.
Realistic open outcomes in daily life:
The gold standard in academic and professional English:
Possibility that something will NOT happen:
MIGHT: Lower Possibility, Doubt & Conditionals (30% - 40%)
We use MIGHT when something is possible, but with clear hesitation, doubt, or smaller statistical odds (30-40%).
Expressing personal doubt or guessing without clues:
Outcomes contingent on external factors:
Doubt about having enough time or completing an action:
Comparative Analysis: May vs Might vs Must
Certeza Lógica: Evidencia directa ineludible.
Posibilidad Realista: Probabilidad media balanceada o permiso.
Menor Probabilidad: Duda o condición hipotética.