Expressing ability – future and past

 

Positive
Modal Past Future
1a can could cannot use can use rule 2a
2a to be able to was/were able to will be able to
3a to know how to knew how to will know how to

 

Negative
Modal Past Future
1b cannot could not cannot use can use rule 2b
2b to (not) be able to was/were not able to will not be able to
3b to (not) know how to did not know how to will not know how to

 

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