could ankylose
Regular verb: ankylose - ankylosed- ankylosed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could ankylose
you could ankylose
he could ankylose
we could ankylose
you could ankylose
they could ankylose 	I could be ankylosing
you could be ankylosing
he could be ankylosing
we could be ankylosing
you could be ankylosing
they could be ankylosing	I could have ankylosed
you could have ankylosed
he could have ankylosed
we could have ankylosed
you could have ankylosed
they could have ankylosed	I could have been ankylosing
you could have been ankylosing
he could have been ankylosing
we could have been ankylosing
you could have been ankylosing
they could have been ankylosing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't ankylose
you couldn't ankylose
he couldn't ankylose
we couldn't ankylose
you couldn't ankylose
they couldn't ankylose 	I couldn't be ankylosing
you couldn't be ankylosing
he couldn't be ankylosing
we couldn't be ankylosing
you couldn't be ankylosing
they couldn't be ankylosing	I couldn't have ankylosed
you couldn't have ankylosed
he couldn't have ankylosed
we couldn't have ankylosed
you couldn't have ankylosed
they couldn't have ankylosed	I couldn't have been ankylosing
you couldn't have been ankylosing
he couldn't have been ankylosing
we couldn't have been ankylosing
you couldn't have been ankylosing
they couldn't have been ankylosing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I ankylose?
could you ankylose?
could he ankylose?
could we ankylose?
could you ankylose?
could they ankylose? 	could I be ankylosing?
could you be ankylosing?
could he be ankylosing?
could we be ankylosing?
could you be ankylosing?
could they be ankylosing? 	could I have ankylosed?
could you have ankylosed?
could he have ankylosed?
could we have ankylosed?
could you have ankylosed?
could they have ankylosed? 	could I have been ankylosing?
could you have been ankylosing?
could he have been ankylosing?
could we have been ankylosing?
could you have been ankylosing?
could they have been ankylosing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I ankylose?
couldn't you ankylose?
couldn't he ankylose?
couldn't we ankylose?
couldn't you ankylose?
couldn't they ankylose? 	couldn't I be ankylosing?
couldn't you be ankylosing?
couldn't he be ankylosing?
couldn't we be ankylosing?
couldn't you be ankylosing?
couldn't they be ankylosing? 	couldn't I have ankylosed?
couldn't you have ankylosed?
couldn't he have ankylosed?
couldn't we have ankylosed?
couldn't you have ankylosed?
couldn't they have ankylosed? 	couldn't I have been ankylosing?
couldn't you have been ankylosing?
couldn't he have been ankylosing?
couldn't we have been ankylosing?
couldn't you have been ankylosing?
couldn't they have been ankylosing?