could detach
Regular verb: detach - detached- detached

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could detach
you could detach
he could detach
we could detach
you could detach
they could detach 	I could be detaching
you could be detaching
he could be detaching
we could be detaching
you could be detaching
they could be detaching	I could have detached
you could have detached
he could have detached
we could have detached
you could have detached
they could have detached	I could have been detaching
you could have been detaching
he could have been detaching
we could have been detaching
you could have been detaching
they could have been detaching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't detach
you couldn't detach
he couldn't detach
we couldn't detach
you couldn't detach
they couldn't detach 	I couldn't be detaching
you couldn't be detaching
he couldn't be detaching
we couldn't be detaching
you couldn't be detaching
they couldn't be detaching	I couldn't have detached
you couldn't have detached
he couldn't have detached
we couldn't have detached
you couldn't have detached
they couldn't have detached	I couldn't have been detaching
you couldn't have been detaching
he couldn't have been detaching
we couldn't have been detaching
you couldn't have been detaching
they couldn't have been detaching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I detach?
could you detach?
could he detach?
could we detach?
could you detach?
could they detach? 	could I be detaching?
could you be detaching?
could he be detaching?
could we be detaching?
could you be detaching?
could they be detaching? 	could I have detached?
could you have detached?
could he have detached?
could we have detached?
could you have detached?
could they have detached? 	could I have been detaching?
could you have been detaching?
could he have been detaching?
could we have been detaching?
could you have been detaching?
could they have been detaching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I detach?
couldn't you detach?
couldn't he detach?
couldn't we detach?
couldn't you detach?
couldn't they detach? 	couldn't I be detaching?
couldn't you be detaching?
couldn't he be detaching?
couldn't we be detaching?
couldn't you be detaching?
couldn't they be detaching? 	couldn't I have detached?
couldn't you have detached?
couldn't he have detached?
couldn't we have detached?
couldn't you have detached?
couldn't they have detached? 	couldn't I have been detaching?
couldn't you have been detaching?
couldn't he have been detaching?
couldn't we have been detaching?
couldn't you have been detaching?
couldn't they have been detaching?