could chatter
Regular verb: chatter - chattered- chattered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could chatter
you could chatter
she could chatter
we could chatter
you could chatter
they could chatter 	I could be chattering
you could be chattering
she could be chattering
we could be chattering
you could be chattering
they could be chattering	I could have chattered
you could have chattered
she could have chattered
we could have chattered
you could have chattered
they could have chattered	I could have been chattering
you could have been chattering
she could have been chattering
we could have been chattering
you could have been chattering
they could have been chattering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't chatter
you couldn't chatter
she couldn't chatter
we couldn't chatter
you couldn't chatter
they couldn't chatter 	I couldn't be chattering
you couldn't be chattering
she couldn't be chattering
we couldn't be chattering
you couldn't be chattering
they couldn't be chattering	I couldn't have chattered
you couldn't have chattered
she couldn't have chattered
we couldn't have chattered
you couldn't have chattered
they couldn't have chattered	I couldn't have been chattering
you couldn't have been chattering
she couldn't have been chattering
we couldn't have been chattering
you couldn't have been chattering
they couldn't have been chattering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I chatter?
could you chatter?
could she chatter?
could we chatter?
could you chatter?
could they chatter? 	could I be chattering?
could you be chattering?
could she be chattering?
could we be chattering?
could you be chattering?
could they be chattering? 	could I have chattered?
could you have chattered?
could she have chattered?
could we have chattered?
could you have chattered?
could they have chattered? 	could I have been chattering?
could you have been chattering?
could she have been chattering?
could we have been chattering?
could you have been chattering?
could they have been chattering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I chatter?
couldn't you chatter?
couldn't she chatter?
couldn't we chatter?
couldn't you chatter?
couldn't they chatter? 	couldn't I be chattering?
couldn't you be chattering?
couldn't she be chattering?
couldn't we be chattering?
couldn't you be chattering?
couldn't they be chattering? 	couldn't I have chattered?
couldn't you have chattered?
couldn't she have chattered?
couldn't we have chattered?
couldn't you have chattered?
couldn't they have chattered? 	couldn't I have been chattering?
couldn't you have been chattering?
couldn't she have been chattering?
couldn't we have been chattering?
couldn't you have been chattering?
couldn't they have been chattering?