I can learn you can learn he can learn we can learn you can learn they can learn
V-ing form
I can be learning you can be learning he can be learning we can be learning you can be learning they can be learning
Perfect
I can have learned, learnt you can have learned, learnt he can have learned, learnt we can have learned, learnt you can have learned, learnt they can have learned, learnt
V-ing perfect
I can have been learning you can have been learning he can have been learning we can have been learning you can have been learning they can have been learning
Negation
Simple form
I can't learn you can't learn he can't learn we can't learn you can't learn they can't learn
V-ing form
I can't be learning you can't be learning he can't be learning we can't be learning you can't be learning they can't be learning
Perfect
I can't have learned, learnt you can't have learned, learnt he can't have learned, learnt we can't have learned, learnt you can't have learned, learnt they can't have learned, learnt
V-ing perfect
I can't have been learning you can't have been learning he can't have been learning we can't have been learning you can't have been learning they can't have been learning
Interrogative form
Simple form
can I learn? can you learn? can he learn? can we learn? can you learn? can they learn?
V-ing form
can I be learning? can you be learning? can he be learning? can we be learning? can you be learning? can they be learning?
Perfect
can I have learned, learnt? can you have learned, learnt? can he have learned, learnt? can we have learned, learnt? can you have learned, learnt? can they have learned, learnt?
V-ing perfect
can I have been learning? can you have been learning? can he have been learning? can we have been learning? can you have been learning? can they have been learning?
Interro-negative form
Simple form
can't I learn? can't you learn? can't he learn? can't we learn? can't you learn? can't they learn?
V-ing form
can't I be learning? can't you be learning? can't he be learning? can't we be learning? can't you be learning? can't they be learning?
Perfect
can't I have learned, learnt? can't you have learned, learnt? can't he have learned, learnt? can't we have learned, learnt? can't you have learned, learnt? can't they have learned, learnt?
V-ing perfect
can't I have been learning? can't you have been learning? can't he have been learning? can't we have been learning? can't you have been learning? can't they have been learning?