could rubberneck
Regular verb: rubberneck - rubbernecked- rubbernecked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could rubberneck
you could rubberneck
he could rubberneck
we could rubberneck
you could rubberneck
they could rubberneck 	I could be rubbernecking
you could be rubbernecking
he could be rubbernecking
we could be rubbernecking
you could be rubbernecking
they could be rubbernecking	I could have rubbernecked
you could have rubbernecked
he could have rubbernecked
we could have rubbernecked
you could have rubbernecked
they could have rubbernecked	I could have been rubbernecking
you could have been rubbernecking
he could have been rubbernecking
we could have been rubbernecking
you could have been rubbernecking
they could have been rubbernecking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't rubberneck
you couldn't rubberneck
he couldn't rubberneck
we couldn't rubberneck
you couldn't rubberneck
they couldn't rubberneck 	I couldn't be rubbernecking
you couldn't be rubbernecking
he couldn't be rubbernecking
we couldn't be rubbernecking
you couldn't be rubbernecking
they couldn't be rubbernecking	I couldn't have rubbernecked
you couldn't have rubbernecked
he couldn't have rubbernecked
we couldn't have rubbernecked
you couldn't have rubbernecked
they couldn't have rubbernecked	I couldn't have been rubbernecking
you couldn't have been rubbernecking
he couldn't have been rubbernecking
we couldn't have been rubbernecking
you couldn't have been rubbernecking
they couldn't have been rubbernecking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I rubberneck?
could you rubberneck?
could he rubberneck?
could we rubberneck?
could you rubberneck?
could they rubberneck? 	could I be rubbernecking?
could you be rubbernecking?
could he be rubbernecking?
could we be rubbernecking?
could you be rubbernecking?
could they be rubbernecking? 	could I have rubbernecked?
could you have rubbernecked?
could he have rubbernecked?
could we have rubbernecked?
could you have rubbernecked?
could they have rubbernecked? 	could I have been rubbernecking?
could you have been rubbernecking?
could he have been rubbernecking?
could we have been rubbernecking?
could you have been rubbernecking?
could they have been rubbernecking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I rubberneck?
couldn't you rubberneck?
couldn't he rubberneck?
couldn't we rubberneck?
couldn't you rubberneck?
couldn't they rubberneck? 	couldn't I be rubbernecking?
couldn't you be rubbernecking?
couldn't he be rubbernecking?
couldn't we be rubbernecking?
couldn't you be rubbernecking?
couldn't they be rubbernecking? 	couldn't I have rubbernecked?
couldn't you have rubbernecked?
couldn't he have rubbernecked?
couldn't we have rubbernecked?
couldn't you have rubbernecked?
couldn't they have rubbernecked? 	couldn't I have been rubbernecking?
couldn't you have been rubbernecking?
couldn't he have been rubbernecking?
couldn't we have been rubbernecking?
couldn't you have been rubbernecking?
couldn't they have been rubbernecking?