could voice
Regular verb: voice - voiced- voiced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could voice
you could voice
she could voice
we could voice
you could voice
they could voice 	I could be voicing
you could be voicing
she could be voicing
we could be voicing
you could be voicing
they could be voicing	I could have voiced
you could have voiced
she could have voiced
we could have voiced
you could have voiced
they could have voiced	I could have been voicing
you could have been voicing
she could have been voicing
we could have been voicing
you could have been voicing
they could have been voicing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't voice
you couldn't voice
she couldn't voice
we couldn't voice
you couldn't voice
they couldn't voice 	I couldn't be voicing
you couldn't be voicing
she couldn't be voicing
we couldn't be voicing
you couldn't be voicing
they couldn't be voicing	I couldn't have voiced
you couldn't have voiced
she couldn't have voiced
we couldn't have voiced
you couldn't have voiced
they couldn't have voiced	I couldn't have been voicing
you couldn't have been voicing
she couldn't have been voicing
we couldn't have been voicing
you couldn't have been voicing
they couldn't have been voicing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I voice?
could you voice?
could she voice?
could we voice?
could you voice?
could they voice? 	could I be voicing?
could you be voicing?
could she be voicing?
could we be voicing?
could you be voicing?
could they be voicing? 	could I have voiced?
could you have voiced?
could she have voiced?
could we have voiced?
could you have voiced?
could they have voiced? 	could I have been voicing?
could you have been voicing?
could she have been voicing?
could we have been voicing?
could you have been voicing?
could they have been voicing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I voice?
couldn't you voice?
couldn't she voice?
couldn't we voice?
couldn't you voice?
couldn't they voice? 	couldn't I be voicing?
couldn't you be voicing?
couldn't she be voicing?
couldn't we be voicing?
couldn't you be voicing?
couldn't they be voicing? 	couldn't I have voiced?
couldn't you have voiced?
couldn't she have voiced?
couldn't we have voiced?
couldn't you have voiced?
couldn't they have voiced? 	couldn't I have been voicing?
couldn't you have been voicing?
couldn't she have been voicing?
couldn't we have been voicing?
couldn't you have been voicing?
couldn't they have been voicing?