could pluck
Regular verb: pluck - plucked- plucked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could pluck
you could pluck
she could pluck
we could pluck
you could pluck
they could pluck 	I could be plucking
you could be plucking
she could be plucking
we could be plucking
you could be plucking
they could be plucking	I could have plucked
you could have plucked
she could have plucked
we could have plucked
you could have plucked
they could have plucked	I could have been plucking
you could have been plucking
she could have been plucking
we could have been plucking
you could have been plucking
they could have been plucking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't pluck
you couldn't pluck
she couldn't pluck
we couldn't pluck
you couldn't pluck
they couldn't pluck 	I couldn't be plucking
you couldn't be plucking
she couldn't be plucking
we couldn't be plucking
you couldn't be plucking
they couldn't be plucking	I couldn't have plucked
you couldn't have plucked
she couldn't have plucked
we couldn't have plucked
you couldn't have plucked
they couldn't have plucked	I couldn't have been plucking
you couldn't have been plucking
she couldn't have been plucking
we couldn't have been plucking
you couldn't have been plucking
they couldn't have been plucking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I pluck?
could you pluck?
could she pluck?
could we pluck?
could you pluck?
could they pluck? 	could I be plucking?
could you be plucking?
could she be plucking?
could we be plucking?
could you be plucking?
could they be plucking? 	could I have plucked?
could you have plucked?
could she have plucked?
could we have plucked?
could you have plucked?
could they have plucked? 	could I have been plucking?
could you have been plucking?
could she have been plucking?
could we have been plucking?
could you have been plucking?
could they have been plucking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I pluck?
couldn't you pluck?
couldn't she pluck?
couldn't we pluck?
couldn't you pluck?
couldn't they pluck? 	couldn't I be plucking?
couldn't you be plucking?
couldn't she be plucking?
couldn't we be plucking?
couldn't you be plucking?
couldn't they be plucking? 	couldn't I have plucked?
couldn't you have plucked?
couldn't she have plucked?
couldn't we have plucked?
couldn't you have plucked?
couldn't they have plucked? 	couldn't I have been plucking?
couldn't you have been plucking?
couldn't she have been plucking?
couldn't we have been plucking?
couldn't you have been plucking?
couldn't they have been plucking?