could ankylose
Regular verb: ankylose - ankylosed- ankylosed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could ankylose
you could ankylose
she could ankylose
we could ankylose
you could ankylose
they could ankylose 	I could be ankylosing
you could be ankylosing
she could be ankylosing
we could be ankylosing
you could be ankylosing
they could be ankylosing	I could have ankylosed
you could have ankylosed
she 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
she 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
she 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
she 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
she 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
she 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 she ankylose?
could we ankylose?
could you ankylose?
could they ankylose? 	could I be ankylosing?
could you be ankylosing?
could she be ankylosing?
could we be ankylosing?
could you be ankylosing?
could they be ankylosing? 	could I have ankylosed?
could you have ankylosed?
could she 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 she 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 she 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 she 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 she 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 she have been ankylosing?
couldn't we have been ankylosing?
couldn't you have been ankylosing?
couldn't they have been ankylosing?