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 could not ankylose
you could not ankylose
he 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
he 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
he 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
he 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 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 	
could I not ankylose?
could you not ankylose?
could he 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 he 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 he 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 he not have been ankylosing?
could we not have been ankylosing?
could you not have been ankylosing?
could they not have been ankylosing?