could plug
Regular verb: plug - plugged- plugged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could plug
you could plug
she could plug
we could plug
you could plug
they could plug 	I could be plugging
you could be plugging
she could be plugging
we could be plugging
you could be plugging
they could be plugging	I could have plugged
you could have plugged
she could have plugged
we could have plugged
you could have plugged
they could have plugged	I could have been plugging
you could have been plugging
she could have been plugging
we could have been plugging
you could have been plugging
they could have been plugging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't plug
you couldn't plug
she couldn't plug
we couldn't plug
you couldn't plug
they couldn't plug 	I couldn't be plugging
you couldn't be plugging
she couldn't be plugging
we couldn't be plugging
you couldn't be plugging
they couldn't be plugging	I couldn't have plugged
you couldn't have plugged
she couldn't have plugged
we couldn't have plugged
you couldn't have plugged
they couldn't have plugged	I couldn't have been plugging
you couldn't have been plugging
she couldn't have been plugging
we couldn't have been plugging
you couldn't have been plugging
they couldn't have been plugging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I plug?
could you plug?
could she plug?
could we plug?
could you plug?
could they plug? 	could I be plugging?
could you be plugging?
could she be plugging?
could we be plugging?
could you be plugging?
could they be plugging? 	could I have plugged?
could you have plugged?
could she have plugged?
could we have plugged?
could you have plugged?
could they have plugged? 	could I have been plugging?
could you have been plugging?
could she have been plugging?
could we have been plugging?
could you have been plugging?
could they have been plugging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I plug?
couldn't you plug?
couldn't she plug?
couldn't we plug?
couldn't you plug?
couldn't they plug? 	couldn't I be plugging?
couldn't you be plugging?
couldn't she be plugging?
couldn't we be plugging?
couldn't you be plugging?
couldn't they be plugging? 	couldn't I have plugged?
couldn't you have plugged?
couldn't she have plugged?
couldn't we have plugged?
couldn't you have plugged?
couldn't they have plugged? 	couldn't I have been plugging?
couldn't you have been plugging?
couldn't she have been plugging?
couldn't we have been plugging?
couldn't you have been plugging?
couldn't they have been plugging?