to express a present ability or an ability that still exists. - Can, to express a guess - Could, to express a past ability  - Could, to express possibility - may, to ask permission - may, To express necessity  - must, To express a future action that must be fulfilled by the doer of the action - shall, to give advice or suggestion - should, to express a future action - will, to give prediction - Will, to express an idea  - Might, To express a condition - Might, To express a desire - Would, To express a future action that was stated in the past - Would, To make a polite offer - Would,

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