I could chow you could chow she could chow we could chow you could chow they could chow
V-ing form
I could be chowing you could be chowing she could be chowing we could be chowing you could be chowing they could be chowing
Perfect
I could have chowed you could have chowed she could have chowed we could have chowed you could have chowed they could have chowed
V-ing perfect
I could have been chowing you could have been chowing she could have been chowing we could have been chowing you could have been chowing they could have been chowing
Negation
Simple form
I couldn't chow you couldn't chow she couldn't chow we couldn't chow you couldn't chow they couldn't chow
V-ing form
I couldn't be chowing you couldn't be chowing she couldn't be chowing we couldn't be chowing you couldn't be chowing they couldn't be chowing
Perfect
I couldn't have chowed you couldn't have chowed she couldn't have chowed we couldn't have chowed you couldn't have chowed they couldn't have chowed
V-ing perfect
I couldn't have been chowing you couldn't have been chowing she couldn't have been chowing we couldn't have been chowing you couldn't have been chowing they couldn't have been chowing
Interrogative form
Simple form
could I chow? could you chow? could she chow? could we chow? could you chow? could they chow?
V-ing form
could I be chowing? could you be chowing? could she be chowing? could we be chowing? could you be chowing? could they be chowing?
Perfect
could I have chowed? could you have chowed? could she have chowed? could we have chowed? could you have chowed? could they have chowed?
V-ing perfect
could I have been chowing? could you have been chowing? could she have been chowing? could we have been chowing? could you have been chowing? could they have been chowing?
Interro-negative form
Simple form
couldn't I chow? couldn't you chow? couldn't she chow? couldn't we chow? couldn't you chow? couldn't they chow?
V-ing form
couldn't I be chowing? couldn't you be chowing? couldn't she be chowing? couldn't we be chowing? couldn't you be chowing? couldn't they be chowing?
Perfect
couldn't I have chowed? couldn't you have chowed? couldn't she have chowed? couldn't we have chowed? couldn't you have chowed? couldn't they have chowed?
V-ing perfect
couldn't I have been chowing? couldn't you have been chowing? couldn't she have been chowing? couldn't we have been chowing? couldn't you have been chowing? couldn't they have been chowing?