I can chop you can chop he can chop we can chop you can chop they can chop
V-ing form
I can be chopping you can be chopping he can be chopping we can be chopping you can be chopping they can be chopping
Perfect
I can have chopped you can have chopped he can have chopped we can have chopped you can have chopped they can have chopped
V-ing perfect
I can have been chopping you can have been chopping he can have been chopping we can have been chopping you can have been chopping they can have been chopping
Negation
Simple form
I can't chop you can't chop he can't chop we can't chop you can't chop they can't chop
V-ing form
I can't be chopping you can't be chopping he can't be chopping we can't be chopping you can't be chopping they can't be chopping
Perfect
I can't have chopped you can't have chopped he can't have chopped we can't have chopped you can't have chopped they can't have chopped
V-ing perfect
I can't have been chopping you can't have been chopping he can't have been chopping we can't have been chopping you can't have been chopping they can't have been chopping
Interrogative form
Simple form
can I chop? can you chop? can he chop? can we chop? can you chop? can they chop?
V-ing form
can I be chopping? can you be chopping? can he be chopping? can we be chopping? can you be chopping? can they be chopping?
Perfect
can I have chopped? can you have chopped? can he have chopped? can we have chopped? can you have chopped? can they have chopped?
V-ing perfect
can I have been chopping? can you have been chopping? can he have been chopping? can we have been chopping? can you have been chopping? can they have been chopping?
Interro-negative form
Simple form
can't I chop? can't you chop? can't he chop? can't we chop? can't you chop? can't they chop?
V-ing form
can't I be chopping? can't you be chopping? can't he be chopping? can't we be chopping? can't you be chopping? can't they be chopping?
Perfect
can't I have chopped? can't you have chopped? can't he have chopped? can't we have chopped? can't you have chopped? can't they have chopped?
V-ing perfect
can't I have been chopping? can't you have been chopping? can't he have been chopping? can't we have been chopping? can't you have been chopping? can't they have been chopping?