could engrail
Regular verb: engrail - engrailed- engrailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could engrail
you could engrail
he could engrail
we could engrail
you could engrail
they could engrail 	I could be engrailing
you could be engrailing
he could be engrailing
we could be engrailing
you could be engrailing
they could be engrailing	I could have engrailed
you could have engrailed
he could have engrailed
we could have engrailed
you could have engrailed
they could have engrailed	I could have been engrailing
you could have been engrailing
he could have been engrailing
we could have been engrailing
you could have been engrailing
they could have been engrailing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't engrail
you couldn't engrail
he couldn't engrail
we couldn't engrail
you couldn't engrail
they couldn't engrail 	I couldn't be engrailing
you couldn't be engrailing
he couldn't be engrailing
we couldn't be engrailing
you couldn't be engrailing
they couldn't be engrailing	I couldn't have engrailed
you couldn't have engrailed
he couldn't have engrailed
we couldn't have engrailed
you couldn't have engrailed
they couldn't have engrailed	I couldn't have been engrailing
you couldn't have been engrailing
he couldn't have been engrailing
we couldn't have been engrailing
you couldn't have been engrailing
they couldn't have been engrailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I engrail?
could you engrail?
could he engrail?
could we engrail?
could you engrail?
could they engrail? 	could I be engrailing?
could you be engrailing?
could he be engrailing?
could we be engrailing?
could you be engrailing?
could they be engrailing? 	could I have engrailed?
could you have engrailed?
could he have engrailed?
could we have engrailed?
could you have engrailed?
could they have engrailed? 	could I have been engrailing?
could you have been engrailing?
could he have been engrailing?
could we have been engrailing?
could you have been engrailing?
could they have been engrailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I engrail?
couldn't you engrail?
couldn't he engrail?
couldn't we engrail?
couldn't you engrail?
couldn't they engrail? 	couldn't I be engrailing?
couldn't you be engrailing?
couldn't he be engrailing?
couldn't we be engrailing?
couldn't you be engrailing?
couldn't they be engrailing? 	couldn't I have engrailed?
couldn't you have engrailed?
couldn't he have engrailed?
couldn't we have engrailed?
couldn't you have engrailed?
couldn't they have engrailed? 	couldn't I have been engrailing?
couldn't you have been engrailing?
couldn't he have been engrailing?
couldn't we have been engrailing?
couldn't you have been engrailing?
couldn't they have been engrailing?