could sideline
Regular verb: sideline - sidelined- sidelined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sideline
you could sideline
he could sideline
we could sideline
you could sideline
they could sideline 	I could be sidelining
you could be sidelining
he could be sidelining
we could be sidelining
you could be sidelining
they could be sidelining	I could have sidelined
you could have sidelined
he could have sidelined
we could have sidelined
you could have sidelined
they could have sidelined	I could have been sidelining
you could have been sidelining
he could have been sidelining
we could have been sidelining
you could have been sidelining
they could have been sidelining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not sideline
you could not sideline
he could not sideline
we could not sideline
you could not sideline
they could not sideline 	I could not be sidelining
you could not be sidelining
he could not be sidelining
we could not be sidelining
you could not be sidelining
they could not be sidelining	I could not have sidelined
you could not have sidelined
he could not have sidelined
we could not have sidelined
you could not have sidelined
they could not have sidelined	I could not have been sidelining
you could not have been sidelining
he could not have been sidelining
we could not have been sidelining
you could not have been sidelining
they could not have been sidelining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sideline?
could you sideline?
could he sideline?
could we sideline?
could you sideline?
could they sideline? 	could I be sidelining?
could you be sidelining?
could he be sidelining?
could we be sidelining?
could you be sidelining?
could they be sidelining? 	could I have sidelined?
could you have sidelined?
could he have sidelined?
could we have sidelined?
could you have sidelined?
could they have sidelined? 	could I have been sidelining?
could you have been sidelining?
could he have been sidelining?
could we have been sidelining?
could you have been sidelining?
could they have been sidelining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not sideline?
could you not sideline?
could he not sideline?
could we not sideline?
could you not sideline?
could they not sideline? 	could I not be sidelining?
could you not be sidelining?
could he not be sidelining?
could we not be sidelining?
could you not be sidelining?
could they not be sidelining? 	could I not have sidelined?
could you not have sidelined?
could he not have sidelined?
could we not have sidelined?
could you not have sidelined?
could they not have sidelined? 	could I not have been sidelining?
could you not have been sidelining?
could he not have been sidelining?
could we not have been sidelining?
could you not have been sidelining?
could they not have been sidelining?