could drowse
Regular verb: drowse - drowsed- drowsed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could drowse
you could drowse
he could drowse
we could drowse
you could drowse
they could drowse 	I could be drowsing
you could be drowsing
he could be drowsing
we could be drowsing
you could be drowsing
they could be drowsing	I could have drowsed
you could have drowsed
he could have drowsed
we could have drowsed
you could have drowsed
they could have drowsed	I could have been drowsing
you could have been drowsing
he could have been drowsing
we could have been drowsing
you could have been drowsing
they could have been drowsing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not drowse
you could not drowse
he could not drowse
we could not drowse
you could not drowse
they could not drowse 	I could not be drowsing
you could not be drowsing
he could not be drowsing
we could not be drowsing
you could not be drowsing
they could not be drowsing	I could not have drowsed
you could not have drowsed
he could not have drowsed
we could not have drowsed
you could not have drowsed
they could not have drowsed	I could not have been drowsing
you could not have been drowsing
he could not have been drowsing
we could not have been drowsing
you could not have been drowsing
they could not have been drowsing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I drowse?
could you drowse?
could he drowse?
could we drowse?
could you drowse?
could they drowse? 	could I be drowsing?
could you be drowsing?
could he be drowsing?
could we be drowsing?
could you be drowsing?
could they be drowsing? 	could I have drowsed?
could you have drowsed?
could he have drowsed?
could we have drowsed?
could you have drowsed?
could they have drowsed? 	could I have been drowsing?
could you have been drowsing?
could he have been drowsing?
could we have been drowsing?
could you have been drowsing?
could they have been drowsing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not drowse?
could you not drowse?
could he not drowse?
could we not drowse?
could you not drowse?
could they not drowse? 	could I not be drowsing?
could you not be drowsing?
could he not be drowsing?
could we not be drowsing?
could you not be drowsing?
could they not be drowsing? 	could I not have drowsed?
could you not have drowsed?
could he not have drowsed?
could we not have drowsed?
could you not have drowsed?
could they not have drowsed? 	could I not have been drowsing?
could you not have been drowsing?
could he not have been drowsing?
could we not have been drowsing?
could you not have been drowsing?
could they not have been drowsing?