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