could protract
Regular verb: protract - protracted- protracted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could protract
you could protract
he could protract
we could protract
you could protract
they could protract 	I could be protracting
you could be protracting
he could be protracting
we could be protracting
you could be protracting
they could be protracting	I could have protracted
you could have protracted
he could have protracted
we could have protracted
you could have protracted
they could have protracted	I could have been protracting
you could have been protracting
he could have been protracting
we could have been protracting
you could have been protracting
they could have been protracting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not protract
you could not protract
he could not protract
we could not protract
you could not protract
they could not protract 	I could not be protracting
you could not be protracting
he could not be protracting
we could not be protracting
you could not be protracting
they could not be protracting	I could not have protracted
you could not have protracted
he could not have protracted
we could not have protracted
you could not have protracted
they could not have protracted	I could not have been protracting
you could not have been protracting
he could not have been protracting
we could not have been protracting
you could not have been protracting
they could not have been protracting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I protract?
could you protract?
could he protract?
could we protract?
could you protract?
could they protract? 	could I be protracting?
could you be protracting?
could he be protracting?
could we be protracting?
could you be protracting?
could they be protracting? 	could I have protracted?
could you have protracted?
could he have protracted?
could we have protracted?
could you have protracted?
could they have protracted? 	could I have been protracting?
could you have been protracting?
could he have been protracting?
could we have been protracting?
could you have been protracting?
could they have been protracting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not protract?
could you not protract?
could he not protract?
could we not protract?
could you not protract?
could they not protract? 	could I not be protracting?
could you not be protracting?
could he not be protracting?
could we not be protracting?
could you not be protracting?
could they not be protracting? 	could I not have protracted?
could you not have protracted?
could he not have protracted?
could we not have protracted?
could you not have protracted?
could they not have protracted? 	could I not have been protracting?
could you not have been protracting?
could he not have been protracting?
could we not have been protracting?
could you not have been protracting?
could they not have been protracting?