I could vegetate you could vegetate she could vegetate we could vegetate you could vegetate they could vegetate
V-ing form
I could be vegetating you could be vegetating she could be vegetating we could be vegetating you could be vegetating they could be vegetating
Perfect
I could have vegetated you could have vegetated she could have vegetated we could have vegetated you could have vegetated they could have vegetated
V-ing perfect
I could have been vegetating you could have been vegetating she could have been vegetating we could have been vegetating you could have been vegetating they could have been vegetating
Negation
Simple form
I could not vegetate you could not vegetate she could not vegetate we could not vegetate you could not vegetate they could not vegetate
V-ing form
I could not be vegetating you could not be vegetating she could not be vegetating we could not be vegetating you could not be vegetating they could not be vegetating
Perfect
I could not have vegetated you could not have vegetated she could not have vegetated we could not have vegetated you could not have vegetated they could not have vegetated
V-ing perfect
I could not have been vegetating you could not have been vegetating she could not have been vegetating we could not have been vegetating you could not have been vegetating they could not have been vegetating
Interrogative form
Simple form
could I vegetate? could you vegetate? could she vegetate? could we vegetate? could you vegetate? could they vegetate?
V-ing form
could I be vegetating? could you be vegetating? could she be vegetating? could we be vegetating? could you be vegetating? could they be vegetating?
Perfect
could I have vegetated? could you have vegetated? could she have vegetated? could we have vegetated? could you have vegetated? could they have vegetated?
V-ing perfect
could I have been vegetating? could you have been vegetating? could she have been vegetating? could we have been vegetating? could you have been vegetating? could they have been vegetating?
Interro-negative form
Simple form
could I not vegetate? could you not vegetate? could she not vegetate? could we not vegetate? could you not vegetate? could they not vegetate?
V-ing form
could I not be vegetating? could you not be vegetating? could she not be vegetating? could we not be vegetating? could you not be vegetating? could they not be vegetating?
Perfect
could I not have vegetated? could you not have vegetated? could she not have vegetated? could we not have vegetated? could you not have vegetated? could they not have vegetated?
V-ing perfect
could I not have been vegetating? could you not have been vegetating? could she not have been vegetating? could we not have been vegetating? could you not have been vegetating? could they not have been vegetating?