could impede
Regular verb: impede - impeded- impeded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could impede
you could impede
she could impede
we could impede
you could impede
they could impede 	I could be impeding
you could be impeding
she could be impeding
we could be impeding
you could be impeding
they could be impeding	I could have impeded
you could have impeded
she could have impeded
we could have impeded
you could have impeded
they could have impeded	I could have been impeding
you could have been impeding
she could have been impeding
we could have been impeding
you could have been impeding
they could have been impeding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't impede
you couldn't impede
she couldn't impede
we couldn't impede
you couldn't impede
they couldn't impede 	I couldn't be impeding
you couldn't be impeding
she couldn't be impeding
we couldn't be impeding
you couldn't be impeding
they couldn't be impeding	I couldn't have impeded
you couldn't have impeded
she couldn't have impeded
we couldn't have impeded
you couldn't have impeded
they couldn't have impeded	I couldn't have been impeding
you couldn't have been impeding
she couldn't have been impeding
we couldn't have been impeding
you couldn't have been impeding
they couldn't have been impeding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I impede?
could you impede?
could she impede?
could we impede?
could you impede?
could they impede? 	could I be impeding?
could you be impeding?
could she be impeding?
could we be impeding?
could you be impeding?
could they be impeding? 	could I have impeded?
could you have impeded?
could she have impeded?
could we have impeded?
could you have impeded?
could they have impeded? 	could I have been impeding?
could you have been impeding?
could she have been impeding?
could we have been impeding?
could you have been impeding?
could they have been impeding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I impede?
couldn't you impede?
couldn't she impede?
couldn't we impede?
couldn't you impede?
couldn't they impede? 	couldn't I be impeding?
couldn't you be impeding?
couldn't she be impeding?
couldn't we be impeding?
couldn't you be impeding?
couldn't they be impeding? 	couldn't I have impeded?
couldn't you have impeded?
couldn't she have impeded?
couldn't we have impeded?
couldn't you have impeded?
couldn't they have impeded? 	couldn't I have been impeding?
couldn't you have been impeding?
couldn't she have been impeding?
couldn't we have been impeding?
couldn't you have been impeding?
couldn't they have been impeding?