I might not pass the exam. I don't feel very confident., She can't be so ill – I saw her playing volleyball yesterday., Did you get the job? That's great! You must be happy., I've bought a lottery ticket. I might become a millionaire!, My key's not in my pocket or on my desk so it must be in the drawer., She can't speak French very well - she's lived in Paris only a few weeks.,

Possibility, certainty and impossibility

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