could stable
Regular verb: stable - stabled- stabled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could stable
you could stable
she could stable
we could stable
you could stable
they could stable 	I could be stabling
you could be stabling
she could be stabling
we could be stabling
you could be stabling
they could be stabling	I could have stabled
you could have stabled
she could have stabled
we could have stabled
you could have stabled
they could have stabled	I could have been stabling
you could have been stabling
she could have been stabling
we could have been stabling
you could have been stabling
they could have been stabling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't stable
you couldn't stable
she couldn't stable
we couldn't stable
you couldn't stable
they couldn't stable 	I couldn't be stabling
you couldn't be stabling
she couldn't be stabling
we couldn't be stabling
you couldn't be stabling
they couldn't be stabling	I couldn't have stabled
you couldn't have stabled
she couldn't have stabled
we couldn't have stabled
you couldn't have stabled
they couldn't have stabled	I couldn't have been stabling
you couldn't have been stabling
she couldn't have been stabling
we couldn't have been stabling
you couldn't have been stabling
they couldn't have been stabling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I stable?
could you stable?
could she stable?
could we stable?
could you stable?
could they stable? 	could I be stabling?
could you be stabling?
could she be stabling?
could we be stabling?
could you be stabling?
could they be stabling? 	could I have stabled?
could you have stabled?
could she have stabled?
could we have stabled?
could you have stabled?
could they have stabled? 	could I have been stabling?
could you have been stabling?
could she have been stabling?
could we have been stabling?
could you have been stabling?
could they have been stabling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I stable?
couldn't you stable?
couldn't she stable?
couldn't we stable?
couldn't you stable?
couldn't they stable? 	couldn't I be stabling?
couldn't you be stabling?
couldn't she be stabling?
couldn't we be stabling?
couldn't you be stabling?
couldn't they be stabling? 	couldn't I have stabled?
couldn't you have stabled?
couldn't she have stabled?
couldn't we have stabled?
couldn't you have stabled?
couldn't they have stabled? 	couldn't I have been stabling?
couldn't you have been stabling?
couldn't she have been stabling?
couldn't we have been stabling?
couldn't you have been stabling?
couldn't they have been stabling?