could plunk
Regular verb: plunk - plunked- plunked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could plunk
you could plunk
he could plunk
we could plunk
you could plunk
they could plunk 	I could be plunking
you could be plunking
he could be plunking
we could be plunking
you could be plunking
they could be plunking	I could have plunked
you could have plunked
he could have plunked
we could have plunked
you could have plunked
they could have plunked	I could have been plunking
you could have been plunking
he could have been plunking
we could have been plunking
you could have been plunking
they could have been plunking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not plunk
you could not plunk
he could not plunk
we could not plunk
you could not plunk
they could not plunk 	I could not be plunking
you could not be plunking
he could not be plunking
we could not be plunking
you could not be plunking
they could not be plunking	I could not have plunked
you could not have plunked
he could not have plunked
we could not have plunked
you could not have plunked
they could not have plunked	I could not have been plunking
you could not have been plunking
he could not have been plunking
we could not have been plunking
you could not have been plunking
they could not have been plunking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I plunk?
could you plunk?
could he plunk?
could we plunk?
could you plunk?
could they plunk? 	could I be plunking?
could you be plunking?
could he be plunking?
could we be plunking?
could you be plunking?
could they be plunking? 	could I have plunked?
could you have plunked?
could he have plunked?
could we have plunked?
could you have plunked?
could they have plunked? 	could I have been plunking?
could you have been plunking?
could he have been plunking?
could we have been plunking?
could you have been plunking?
could they have been plunking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not plunk?
could you not plunk?
could he not plunk?
could we not plunk?
could you not plunk?
could they not plunk? 	could I not be plunking?
could you not be plunking?
could he not be plunking?
could we not be plunking?
could you not be plunking?
could they not be plunking? 	could I not have plunked?
could you not have plunked?
could he not have plunked?
could we not have plunked?
could you not have plunked?
could they not have plunked? 	could I not have been plunking?
could you not have been plunking?
could he not have been plunking?
could we not have been plunking?
could you not have been plunking?
could they not have been plunking?