I could convey you could convey he could convey we could convey you could convey they could convey
V-ing form
I could be conveying you could be conveying he could be conveying we could be conveying you could be conveying they could be conveying
Perfect
I could have conveyed you could have conveyed he could have conveyed we could have conveyed you could have conveyed they could have conveyed
V-ing perfect
I could have been conveying you could have been conveying he could have been conveying we could have been conveying you could have been conveying they could have been conveying
Negation
Simple form
I couldn't convey you couldn't convey he couldn't convey we couldn't convey you couldn't convey they couldn't convey
V-ing form
I couldn't be conveying you couldn't be conveying he couldn't be conveying we couldn't be conveying you couldn't be conveying they couldn't be conveying
Perfect
I couldn't have conveyed you couldn't have conveyed he couldn't have conveyed we couldn't have conveyed you couldn't have conveyed they couldn't have conveyed
V-ing perfect
I couldn't have been conveying you couldn't have been conveying he couldn't have been conveying we couldn't have been conveying you couldn't have been conveying they couldn't have been conveying
Interrogative form
Simple form
could I convey? could you convey? could he convey? could we convey? could you convey? could they convey?
V-ing form
could I be conveying? could you be conveying? could he be conveying? could we be conveying? could you be conveying? could they be conveying?
Perfect
could I have conveyed? could you have conveyed? could he have conveyed? could we have conveyed? could you have conveyed? could they have conveyed?
V-ing perfect
could I have been conveying? could you have been conveying? could he have been conveying? could we have been conveying? could you have been conveying? could they have been conveying?
Interro-negative form
Simple form
couldn't I convey? couldn't you convey? couldn't he convey? couldn't we convey? couldn't you convey? couldn't they convey?
V-ing form
couldn't I be conveying? couldn't you be conveying? couldn't he be conveying? couldn't we be conveying? couldn't you be conveying? couldn't they be conveying?
Perfect
couldn't I have conveyed? couldn't you have conveyed? couldn't he have conveyed? couldn't we have conveyed? couldn't you have conveyed? couldn't they have conveyed?
V-ing perfect
couldn't I have been conveying? couldn't you have been conveying? couldn't he have been conveying? couldn't we have been conveying? couldn't you have been conveying? couldn't they have been conveying?