could denature
Regular verb: denature - denatured- denatured

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could denature
you could denature
she could denature
we could denature
you could denature
they could denature 	I could be denaturing
you could be denaturing
she could be denaturing
we could be denaturing
you could be denaturing
they could be denaturing	I could have denatured
you could have denatured
she could have denatured
we could have denatured
you could have denatured
they could have denatured	I could have been denaturing
you could have been denaturing
she could have been denaturing
we could have been denaturing
you could have been denaturing
they could have been denaturing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not denature
you could not denature
she could not denature
we could not denature
you could not denature
they could not denature 	I could not be denaturing
you could not be denaturing
she could not be denaturing
we could not be denaturing
you could not be denaturing
they could not be denaturing	I could not have denatured
you could not have denatured
she could not have denatured
we could not have denatured
you could not have denatured
they could not have denatured	I could not have been denaturing
you could not have been denaturing
she could not have been denaturing
we could not have been denaturing
you could not have been denaturing
they could not have been denaturing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I denature?
could you denature?
could she denature?
could we denature?
could you denature?
could they denature? 	could I be denaturing?
could you be denaturing?
could she be denaturing?
could we be denaturing?
could you be denaturing?
could they be denaturing? 	could I have denatured?
could you have denatured?
could she have denatured?
could we have denatured?
could you have denatured?
could they have denatured? 	could I have been denaturing?
could you have been denaturing?
could she have been denaturing?
could we have been denaturing?
could you have been denaturing?
could they have been denaturing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not denature?
could you not denature?
could she not denature?
could we not denature?
could you not denature?
could they not denature? 	could I not be denaturing?
could you not be denaturing?
could she not be denaturing?
could we not be denaturing?
could you not be denaturing?
could they not be denaturing? 	could I not have denatured?
could you not have denatured?
could she not have denatured?
could we not have denatured?
could you not have denatured?
could they not have denatured? 	could I not have been denaturing?
could you not have been denaturing?
could she not have been denaturing?
could we not have been denaturing?
could you not have been denaturing?
could they not have been denaturing?