I can earn you can earn he can earn we can earn you can earn they can earn
V-ing form
I can be earning you can be earning he can be earning we can be earning you can be earning they can be earning
Perfect
I can have earned you can have earned he can have earned we can have earned you can have earned they can have earned
V-ing perfect
I can have been earning you can have been earning he can have been earning we can have been earning you can have been earning they can have been earning
Negation
Simple form
I can't earn you can't earn he can't earn we can't earn you can't earn they can't earn
V-ing form
I can't be earning you can't be earning he can't be earning we can't be earning you can't be earning they can't be earning
Perfect
I can't have earned you can't have earned he can't have earned we can't have earned you can't have earned they can't have earned
V-ing perfect
I can't have been earning you can't have been earning he can't have been earning we can't have been earning you can't have been earning they can't have been earning
Interrogative form
Simple form
can I earn? can you earn? can he earn? can we earn? can you earn? can they earn?
V-ing form
can I be earning? can you be earning? can he be earning? can we be earning? can you be earning? can they be earning?
Perfect
can I have earned? can you have earned? can he have earned? can we have earned? can you have earned? can they have earned?
V-ing perfect
can I have been earning? can you have been earning? can he have been earning? can we have been earning? can you have been earning? can they have been earning?
Interro-negative form
Simple form
can't I earn? can't you earn? can't he earn? can't we earn? can't you earn? can't they earn?
V-ing form
can't I be earning? can't you be earning? can't he be earning? can't we be earning? can't you be earning? can't they be earning?
Perfect
can't I have earned? can't you have earned? can't he have earned? can't we have earned? can't you have earned? can't they have earned?
V-ing perfect
can't I have been earning? can't you have been earning? can't he have been earning? can't we have been earning? can't you have been earning? can't they have been earning?