could shop
Regular verb: shop - shopped- shopped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could shop
you could shop
she could shop
we could shop
you could shop
they could shop 	I could be shopping
you could be shopping
she could be shopping
we could be shopping
you could be shopping
they could be shopping	I could have shopped
you could have shopped
she could have shopped
we could have shopped
you could have shopped
they could have shopped	I could have been shopping
you could have been shopping
she could have been shopping
we could have been shopping
you could have been shopping
they could have been shopping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't shop
you couldn't shop
she couldn't shop
we couldn't shop
you couldn't shop
they couldn't shop 	I couldn't be shopping
you couldn't be shopping
she couldn't be shopping
we couldn't be shopping
you couldn't be shopping
they couldn't be shopping	I couldn't have shopped
you couldn't have shopped
she couldn't have shopped
we couldn't have shopped
you couldn't have shopped
they couldn't have shopped	I couldn't have been shopping
you couldn't have been shopping
she couldn't have been shopping
we couldn't have been shopping
you couldn't have been shopping
they couldn't have been shopping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I shop?
could you shop?
could she shop?
could we shop?
could you shop?
could they shop? 	could I be shopping?
could you be shopping?
could she be shopping?
could we be shopping?
could you be shopping?
could they be shopping? 	could I have shopped?
could you have shopped?
could she have shopped?
could we have shopped?
could you have shopped?
could they have shopped? 	could I have been shopping?
could you have been shopping?
could she have been shopping?
could we have been shopping?
could you have been shopping?
could they have been shopping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I shop?
couldn't you shop?
couldn't she shop?
couldn't we shop?
couldn't you shop?
couldn't they shop? 	couldn't I be shopping?
couldn't you be shopping?
couldn't she be shopping?
couldn't we be shopping?
couldn't you be shopping?
couldn't they be shopping? 	couldn't I have shopped?
couldn't you have shopped?
couldn't she have shopped?
couldn't we have shopped?
couldn't you have shopped?
couldn't they have shopped? 	couldn't I have been shopping?
couldn't you have been shopping?
couldn't she have been shopping?
couldn't we have been shopping?
couldn't you have been shopping?
couldn't they have been shopping?