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