could revalidate
Regular verb: revalidate - revalidated- revalidated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could revalidate
you could revalidate
she could revalidate
we could revalidate
you could revalidate
they could revalidate 	I could be revalidating
you could be revalidating
she could be revalidating
we could be revalidating
you could be revalidating
they could be revalidating	I could have revalidated
you could have revalidated
she could have revalidated
we could have revalidated
you could have revalidated
they could have revalidated	I could have been revalidating
you could have been revalidating
she could have been revalidating
we could have been revalidating
you could have been revalidating
they could have been revalidating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not revalidate
you could not revalidate
she could not revalidate
we could not revalidate
you could not revalidate
they could not revalidate 	I could not be revalidating
you could not be revalidating
she could not be revalidating
we could not be revalidating
you could not be revalidating
they could not be revalidating	I could not have revalidated
you could not have revalidated
she could not have revalidated
we could not have revalidated
you could not have revalidated
they could not have revalidated	I could not have been revalidating
you could not have been revalidating
she could not have been revalidating
we could not have been revalidating
you could not have been revalidating
they could not have been revalidating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I revalidate?
could you revalidate?
could she revalidate?
could we revalidate?
could you revalidate?
could they revalidate? 	could I be revalidating?
could you be revalidating?
could she be revalidating?
could we be revalidating?
could you be revalidating?
could they be revalidating? 	could I have revalidated?
could you have revalidated?
could she have revalidated?
could we have revalidated?
could you have revalidated?
could they have revalidated? 	could I have been revalidating?
could you have been revalidating?
could she have been revalidating?
could we have been revalidating?
could you have been revalidating?
could they have been revalidating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not revalidate?
could you not revalidate?
could she not revalidate?
could we not revalidate?
could you not revalidate?
could they not revalidate? 	could I not be revalidating?
could you not be revalidating?
could she not be revalidating?
could we not be revalidating?
could you not be revalidating?
could they not be revalidating? 	could I not have revalidated?
could you not have revalidated?
could she not have revalidated?
could we not have revalidated?
could you not have revalidated?
could they not have revalidated? 	could I not have been revalidating?
could you not have been revalidating?
could she not have been revalidating?
could we not have been revalidating?
could you not have been revalidating?
could they not have been revalidating?