could wail
Regular verb: wail - wailed- wailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could wail
you could wail
he could wail
we could wail
you could wail
they could wail 	I could be wailing
you could be wailing
he could be wailing
we could be wailing
you could be wailing
they could be wailing	I could have wailed
you could have wailed
he could have wailed
we could have wailed
you could have wailed
they could have wailed	I could have been wailing
you could have been wailing
he could have been wailing
we could have been wailing
you could have been wailing
they could have been wailing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't wail
you couldn't wail
he couldn't wail
we couldn't wail
you couldn't wail
they couldn't wail 	I couldn't be wailing
you couldn't be wailing
he couldn't be wailing
we couldn't be wailing
you couldn't be wailing
they couldn't be wailing	I couldn't have wailed
you couldn't have wailed
he couldn't have wailed
we couldn't have wailed
you couldn't have wailed
they couldn't have wailed	I couldn't have been wailing
you couldn't have been wailing
he couldn't have been wailing
we couldn't have been wailing
you couldn't have been wailing
they couldn't have been wailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I wail?
could you wail?
could he wail?
could we wail?
could you wail?
could they wail? 	could I be wailing?
could you be wailing?
could he be wailing?
could we be wailing?
could you be wailing?
could they be wailing? 	could I have wailed?
could you have wailed?
could he have wailed?
could we have wailed?
could you have wailed?
could they have wailed? 	could I have been wailing?
could you have been wailing?
could he have been wailing?
could we have been wailing?
could you have been wailing?
could they have been wailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I wail?
couldn't you wail?
couldn't he wail?
couldn't we wail?
couldn't you wail?
couldn't they wail? 	couldn't I be wailing?
couldn't you be wailing?
couldn't he be wailing?
couldn't we be wailing?
couldn't you be wailing?
couldn't they be wailing? 	couldn't I have wailed?
couldn't you have wailed?
couldn't he have wailed?
couldn't we have wailed?
couldn't you have wailed?
couldn't they have wailed? 	couldn't I have been wailing?
couldn't you have been wailing?
couldn't he have been wailing?
couldn't we have been wailing?
couldn't you have been wailing?
couldn't they have been wailing?