could pioneer
Regular verb: pioneer - pioneered- pioneered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could pioneer
you could pioneer
she could pioneer
we could pioneer
you could pioneer
they could pioneer 	I could be pioneering
you could be pioneering
she could be pioneering
we could be pioneering
you could be pioneering
they could be pioneering	I could have pioneered
you could have pioneered
she could have pioneered
we could have pioneered
you could have pioneered
they could have pioneered	I could have been pioneering
you could have been pioneering
she could have been pioneering
we could have been pioneering
you could have been pioneering
they could have been pioneering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not pioneer
you could not pioneer
she could not pioneer
we could not pioneer
you could not pioneer
they could not pioneer 	I could not be pioneering
you could not be pioneering
she could not be pioneering
we could not be pioneering
you could not be pioneering
they could not be pioneering	I could not have pioneered
you could not have pioneered
she could not have pioneered
we could not have pioneered
you could not have pioneered
they could not have pioneered	I could not have been pioneering
you could not have been pioneering
she could not have been pioneering
we could not have been pioneering
you could not have been pioneering
they could not have been pioneering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I pioneer?
could you pioneer?
could she pioneer?
could we pioneer?
could you pioneer?
could they pioneer? 	could I be pioneering?
could you be pioneering?
could she be pioneering?
could we be pioneering?
could you be pioneering?
could they be pioneering? 	could I have pioneered?
could you have pioneered?
could she have pioneered?
could we have pioneered?
could you have pioneered?
could they have pioneered? 	could I have been pioneering?
could you have been pioneering?
could she have been pioneering?
could we have been pioneering?
could you have been pioneering?
could they have been pioneering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not pioneer?
could you not pioneer?
could she not pioneer?
could we not pioneer?
could you not pioneer?
could they not pioneer? 	could I not be pioneering?
could you not be pioneering?
could she not be pioneering?
could we not be pioneering?
could you not be pioneering?
could they not be pioneering? 	could I not have pioneered?
could you not have pioneered?
could she not have pioneered?
could we not have pioneered?
could you not have pioneered?
could they not have pioneered? 	could I not have been pioneering?
could you not have been pioneering?
could she not have been pioneering?
could we not have been pioneering?
could you not have been pioneering?
could they not have been pioneering?