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Modal verbs can ___ us understand how to express abilities.
For example, when we say 'I can play', we show that we ___ the skill to play.
Also, we can use modal verbs to say what we ___ do, like 'I must study'.
Sometimes, we say 'you may' for permission, showing that you ___ do something.
In this way, modal verbs ___ a very important role in English.