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 could not ankylose
you could not ankylose
she could not ankylose
we could not ankylose
you could not ankylose
they could not ankylose 	I could not be ankylosing
you could not be ankylosing
she could not be ankylosing
we could not be ankylosing
you could not be ankylosing
they could not be ankylosing	I could not have ankylosed
you could not have ankylosed
she could not have ankylosed
we could not have ankylosed
you could not have ankylosed
they could not have ankylosed	I could not have been ankylosing
you could not have been ankylosing
she could not have been ankylosing
we could not have been ankylosing
you could not have been ankylosing
they could not 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 	
could I not ankylose?
could you not ankylose?
could she not ankylose?
could we not ankylose?
could you not ankylose?
could they not ankylose? 	could I not be ankylosing?
could you not be ankylosing?
could she not be ankylosing?
could we not be ankylosing?
could you not be ankylosing?
could they not be ankylosing? 	could I not have ankylosed?
could you not have ankylosed?
could she not have ankylosed?
could we not have ankylosed?
could you not have ankylosed?
could they not have ankylosed? 	could I not have been ankylosing?
could you not have been ankylosing?
could she not have been ankylosing?
could we not have been ankylosing?
could you not have been ankylosing?
could they not have been ankylosing?