could revoke
Regular verb: revoke - revoked- revoked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could revoke
you could revoke
she could revoke
we could revoke
you could revoke
they could revoke 	I could be revoking
you could be revoking
she could be revoking
we could be revoking
you could be revoking
they could be revoking	I could have revoked
you could have revoked
she could have revoked
we could have revoked
you could have revoked
they could have revoked	I could have been revoking
you could have been revoking
she could have been revoking
we could have been revoking
you could have been revoking
they could have been revoking	

Negation 	
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I couldn't revoke
you couldn't revoke
she couldn't revoke
we couldn't revoke
you couldn't revoke
they couldn't revoke 	I couldn't be revoking
you couldn't be revoking
she couldn't be revoking
we couldn't be revoking
you couldn't be revoking
they couldn't be revoking	I couldn't have revoked
you couldn't have revoked
she couldn't have revoked
we couldn't have revoked
you couldn't have revoked
they couldn't have revoked	I couldn't have been revoking
you couldn't have been revoking
she couldn't have been revoking
we couldn't have been revoking
you couldn't have been revoking
they couldn't have been revoking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I revoke?
could you revoke?
could she revoke?
could we revoke?
could you revoke?
could they revoke? 	could I be revoking?
could you be revoking?
could she be revoking?
could we be revoking?
could you be revoking?
could they be revoking? 	could I have revoked?
could you have revoked?
could she have revoked?
could we have revoked?
could you have revoked?
could they have revoked? 	could I have been revoking?
could you have been revoking?
could she have been revoking?
could we have been revoking?
could you have been revoking?
could they have been revoking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I revoke?
couldn't you revoke?
couldn't she revoke?
couldn't we revoke?
couldn't you revoke?
couldn't they revoke? 	couldn't I be revoking?
couldn't you be revoking?
couldn't she be revoking?
couldn't we be revoking?
couldn't you be revoking?
couldn't they be revoking? 	couldn't I have revoked?
couldn't you have revoked?
couldn't she have revoked?
couldn't we have revoked?
couldn't you have revoked?
couldn't they have revoked? 	couldn't I have been revoking?
couldn't you have been revoking?
couldn't she have been revoking?
couldn't we have been revoking?
couldn't you have been revoking?
couldn't they have been revoking?