I could convoy you could convoy he could convoy we could convoy you could convoy they could convoy
V-ing form
I could be convoying you could be convoying he could be convoying we could be convoying you could be convoying they could be convoying
Perfect
I could have convoyed you could have convoyed he 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 he 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 he 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 he 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 he 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 he 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 he convoy? could we convoy? could you convoy? could they convoy?
V-ing form
could I be convoying? could you be convoying? could he be convoying? could we be convoying? could you be convoying? could they be convoying?
Perfect
could I have convoyed? could you have convoyed? could he 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 he 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 he 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 he 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 he 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 he have been convoying? couldn't we have been convoying? couldn't you have been convoying? couldn't they have been convoying?