could derai
Regular verb: derai - deraied- deraied

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could derai
you could derai
he could derai
we could derai
you could derai
they could derai 	I could be deraiing
you could be deraiing
he could be deraiing
we could be deraiing
you could be deraiing
they could be deraiing	I could have deraied
you could have deraied
he could have deraied
we could have deraied
you could have deraied
they could have deraied	I could have been deraiing
you could have been deraiing
he could have been deraiing
we could have been deraiing
you could have been deraiing
they could have been deraiing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't derai
you couldn't derai
he couldn't derai
we couldn't derai
you couldn't derai
they couldn't derai 	I couldn't be deraiing
you couldn't be deraiing
he couldn't be deraiing
we couldn't be deraiing
you couldn't be deraiing
they couldn't be deraiing	I couldn't have deraied
you couldn't have deraied
he couldn't have deraied
we couldn't have deraied
you couldn't have deraied
they couldn't have deraied	I couldn't have been deraiing
you couldn't have been deraiing
he couldn't have been deraiing
we couldn't have been deraiing
you couldn't have been deraiing
they couldn't have been deraiing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I derai?
could you derai?
could he derai?
could we derai?
could you derai?
could they derai? 	could I be deraiing?
could you be deraiing?
could he be deraiing?
could we be deraiing?
could you be deraiing?
could they be deraiing? 	could I have deraied?
could you have deraied?
could he have deraied?
could we have deraied?
could you have deraied?
could they have deraied? 	could I have been deraiing?
could you have been deraiing?
could he have been deraiing?
could we have been deraiing?
could you have been deraiing?
could they have been deraiing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I derai?
couldn't you derai?
couldn't he derai?
couldn't we derai?
couldn't you derai?
couldn't they derai? 	couldn't I be deraiing?
couldn't you be deraiing?
couldn't he be deraiing?
couldn't we be deraiing?
couldn't you be deraiing?
couldn't they be deraiing? 	couldn't I have deraied?
couldn't you have deraied?
couldn't he have deraied?
couldn't we have deraied?
couldn't you have deraied?
couldn't they have deraied? 	couldn't I have been deraiing?
couldn't you have been deraiing?
couldn't he have been deraiing?
couldn't we have been deraiing?
couldn't you have been deraiing?
couldn't they have been deraiing?