could cluck
Regular verb: cluck - clucked- clucked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could cluck
you could cluck
he could cluck
we could cluck
you could cluck
they could cluck 	I could be clucking
you could be clucking
he could be clucking
we could be clucking
you could be clucking
they could be clucking	I could have clucked
you could have clucked
he could have clucked
we could have clucked
you could have clucked
they could have clucked	I could have been clucking
you could have been clucking
he could have been clucking
we could have been clucking
you could have been clucking
they could have been clucking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not cluck
you could not cluck
he could not cluck
we could not cluck
you could not cluck
they could not cluck 	I could not be clucking
you could not be clucking
he could not be clucking
we could not be clucking
you could not be clucking
they could not be clucking	I could not have clucked
you could not have clucked
he could not have clucked
we could not have clucked
you could not have clucked
they could not have clucked	I could not have been clucking
you could not have been clucking
he could not have been clucking
we could not have been clucking
you could not have been clucking
they could not have been clucking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I cluck?
could you cluck?
could he cluck?
could we cluck?
could you cluck?
could they cluck? 	could I be clucking?
could you be clucking?
could he be clucking?
could we be clucking?
could you be clucking?
could they be clucking? 	could I have clucked?
could you have clucked?
could he have clucked?
could we have clucked?
could you have clucked?
could they have clucked? 	could I have been clucking?
could you have been clucking?
could he have been clucking?
could we have been clucking?
could you have been clucking?
could they have been clucking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not cluck?
could you not cluck?
could he not cluck?
could we not cluck?
could you not cluck?
could they not cluck? 	could I not be clucking?
could you not be clucking?
could he not be clucking?
could we not be clucking?
could you not be clucking?
could they not be clucking? 	could I not have clucked?
could you not have clucked?
could he not have clucked?
could we not have clucked?
could you not have clucked?
could they not have clucked? 	could I not have been clucking?
could you not have been clucking?
could he not have been clucking?
could we not have been clucking?
could you not have been clucking?
could they not have been clucking?