Expressing ability – future and past

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Positive
ModalPastFuture
1acancouldcannot use can use rule 2a
2ato be able towas/were able towill be able to
3ato know how toknew how towill know how to

 

Negative
ModalPastFuture
1bcannotcould notcannot use can use rule 2b
2bto (not) be able towas/were not able towill not be able to
3bto (not) know how todid not know how towill not know how to

 


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