could drowse
Verbo regular: drowse - drowsed- drowsed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't drowse
you couldn't drowse
he couldn't drowse
we couldn't drowse
you couldn't drowse
they couldn't drowse 	I couldn't be drowsing
you couldn't be drowsing
he couldn't be drowsing
we couldn't be drowsing
you couldn't be drowsing
they couldn't be drowsing	I couldn't have drowsed
you couldn't have drowsed
he couldn't have drowsed
we couldn't have drowsed
you couldn't have drowsed
they couldn't have drowsed	I couldn't have been drowsing
you couldn't have been drowsing
he couldn't have been drowsing
we couldn't have been drowsing
you couldn't have been drowsing
they couldn't have been drowsing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I drowse?
couldn't you drowse?
couldn't he drowse?
couldn't we drowse?
couldn't you drowse?
couldn't they drowse? 	couldn't I be drowsing?
couldn't you be drowsing?
couldn't he be drowsing?
couldn't we be drowsing?
couldn't you be drowsing?
couldn't they be drowsing? 	couldn't I have drowsed?
couldn't you have drowsed?
couldn't he have drowsed?
couldn't we have drowsed?
couldn't you have drowsed?
couldn't they have drowsed? 	couldn't I have been drowsing?
couldn't you have been drowsing?
couldn't he have been drowsing?
couldn't we have been drowsing?
couldn't you have been drowsing?
couldn't they have been drowsing?