I can shop you can shop he can shop we can shop you can shop they can shop
V-ing form
I can be shopping you can be shopping he can be shopping we can be shopping you can be shopping they can be shopping
Perfect
I can have shopped you can have shopped he can have shopped we can have shopped you can have shopped they can have shopped
V-ing perfect
I can have been shopping you can have been shopping he can have been shopping we can have been shopping you can have been shopping they can have been shopping
Negation
Simple form
I can't shop you can't shop he can't shop we can't shop you can't shop they can't shop
V-ing form
I can't be shopping you can't be shopping he can't be shopping we can't be shopping you can't be shopping they can't be shopping
Perfect
I can't have shopped you can't have shopped he can't have shopped we can't have shopped you can't have shopped they can't have shopped
V-ing perfect
I can't have been shopping you can't have been shopping he can't have been shopping we can't have been shopping you can't have been shopping they can't have been shopping
Interrogative form
Simple form
can I shop? can you shop? can he shop? can we shop? can you shop? can they shop?
V-ing form
can I be shopping? can you be shopping? can he be shopping? can we be shopping? can you be shopping? can they be shopping?
Perfect
can I have shopped? can you have shopped? can he have shopped? can we have shopped? can you have shopped? can they have shopped?
V-ing perfect
can I have been shopping? can you have been shopping? can he have been shopping? can we have been shopping? can you have been shopping? can they have been shopping?
Interro-negative form
Simple form
can't I shop? can't you shop? can't he shop? can't we shop? can't you shop? can't they shop?
V-ing form
can't I be shopping? can't you be shopping? can't he be shopping? can't we be shopping? can't you be shopping? can't they be shopping?
Perfect
can't I have shopped? can't you have shopped? can't he have shopped? can't we have shopped? can't you have shopped? can't they have shopped?
V-ing perfect
can't I have been shopping? can't you have been shopping? can't he have been shopping? can't we have been shopping? can't you have been shopping? can't they have been shopping?