could vegetate
Regular verb: vegetate - vegetated- vegetated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could vegetate
you could vegetate
he could vegetate
we could vegetate
you could vegetate
they could vegetate 	I could be vegetating
you could be vegetating
he could be vegetating
we could be vegetating
you could be vegetating
they could be vegetating	I could have vegetated
you could have vegetated
he could have vegetated
we could have vegetated
you could have vegetated
they could have vegetated	I could have been vegetating
you could have been vegetating
he could have been vegetating
we could have been vegetating
you could have been vegetating
they could have been vegetating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't vegetate
you couldn't vegetate
he couldn't vegetate
we couldn't vegetate
you couldn't vegetate
they couldn't vegetate 	I couldn't be vegetating
you couldn't be vegetating
he couldn't be vegetating
we couldn't be vegetating
you couldn't be vegetating
they couldn't be vegetating	I couldn't have vegetated
you couldn't have vegetated
he couldn't have vegetated
we couldn't have vegetated
you couldn't have vegetated
they couldn't have vegetated	I couldn't have been vegetating
you couldn't have been vegetating
he couldn't have been vegetating
we couldn't have been vegetating
you couldn't have been vegetating
they couldn't have been vegetating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I vegetate?
could you vegetate?
could he vegetate?
could we vegetate?
could you vegetate?
could they vegetate? 	could I be vegetating?
could you be vegetating?
could he be vegetating?
could we be vegetating?
could you be vegetating?
could they be vegetating? 	could I have vegetated?
could you have vegetated?
could he have vegetated?
could we have vegetated?
could you have vegetated?
could they have vegetated? 	could I have been vegetating?
could you have been vegetating?
could he have been vegetating?
could we have been vegetating?
could you have been vegetating?
could they have been vegetating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I vegetate?
couldn't you vegetate?
couldn't he vegetate?
couldn't we vegetate?
couldn't you vegetate?
couldn't they vegetate? 	couldn't I be vegetating?
couldn't you be vegetating?
couldn't he be vegetating?
couldn't we be vegetating?
couldn't you be vegetating?
couldn't they be vegetating? 	couldn't I have vegetated?
couldn't you have vegetated?
couldn't he have vegetated?
couldn't we have vegetated?
couldn't you have vegetated?
couldn't they have vegetated? 	couldn't I have been vegetating?
couldn't you have been vegetating?
couldn't he have been vegetating?
couldn't we have been vegetating?
couldn't you have been vegetating?
couldn't they have been vegetating?