English verb conjugation
COULD PIONEER

Regular verb: pioneer - pioneered - pioneered

Affirmation

Simple form	V-ing form
I could pioneer you could pioneer he could pioneer we could pioneer you could pioneer they could pioneer	I could be pioneering you could be pioneering he could be pioneering we could be pioneering you could be pioneering they could be pioneering
Perfect	V-ing perfect
I could have pioneered you could have pioneered he 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 he 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
I couldn't pioneer you couldn't pioneer he couldn't pioneer we couldn't pioneer you couldn't pioneer they couldn't pioneer	I couldn't be pioneering you couldn't be pioneering he couldn't be pioneering we couldn't be pioneering you couldn't be pioneering they couldn't be pioneering
Perfect	V-ing perfect
I couldn't have pioneered you couldn't have pioneered he couldn't have pioneered we couldn't have pioneered you couldn't have pioneered they couldn't have pioneered	I couldn't have been pioneering you couldn't have been pioneering he couldn't have been pioneering we couldn't have been pioneering you couldn't have been pioneering they couldn't have been pioneering

Interrogative form

Simple form	V-ing form
could I pioneer? could you pioneer? could he pioneer? could we pioneer? could you pioneer? could they pioneer?	could I be pioneering? could you be pioneering? could he be pioneering? could we be pioneering? could you be pioneering? could they be pioneering?
Perfect	V-ing perfect
could I have pioneered? could you have pioneered? could he 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 he 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
couldn't I pioneer? couldn't you pioneer? couldn't he pioneer? couldn't we pioneer? couldn't you pioneer? couldn't they pioneer?	couldn't I be pioneering? couldn't you be pioneering? couldn't he be pioneering? couldn't we be pioneering? couldn't you be pioneering? couldn't they be pioneering?
Perfect	V-ing perfect
couldn't I have pioneered? couldn't you have pioneered? couldn't he have pioneered? couldn't we have pioneered? couldn't you have pioneered? couldn't they have pioneered?	couldn't I have been pioneering? couldn't you have been pioneering? couldn't he have been pioneering? couldn't we have been pioneering? couldn't you have been pioneering? couldn't they have been pioneering?