English verb conjugation
COULD STROP

Regular verb: strop - stropped - stropped

Affirmation

Simple form	V-ing form
I could strop you could strop he could strop we could strop you could strop they could strop	I could be stropping you could be stropping he could be stropping we could be stropping you could be stropping they could be stropping
Perfect	V-ing perfect
I could have stropped you could have stropped he could have stropped we could have stropped you could have stropped they could have stropped	I could have been stropping you could have been stropping he could have been stropping we could have been stropping you could have been stropping they could have been stropping

Negation

Simple form	V-ing form
I could not strop you could not strop he could not strop we could not strop you could not strop they could not strop	I could not be stropping you could not be stropping he could not be stropping we could not be stropping you could not be stropping they could not be stropping
Perfect	V-ing perfect
I could not have stropped you could not have stropped he could not have stropped we could not have stropped you could not have stropped they could not have stropped	I could not have been stropping you could not have been stropping he could not have been stropping we could not have been stropping you could not have been stropping they could not have been stropping

Interrogative form

Simple form	V-ing form
could I strop? could you strop? could he strop? could we strop? could you strop? could they strop?	could I be stropping? could you be stropping? could he be stropping? could we be stropping? could you be stropping? could they be stropping?
Perfect	V-ing perfect
could I have stropped? could you have stropped? could he have stropped? could we have stropped? could you have stropped? could they have stropped?	could I have been stropping? could you have been stropping? could he have been stropping? could we have been stropping? could you have been stropping? could they have been stropping?

Interro-negative form

Simple form	V-ing form
could I not strop? could you not strop? could he not strop? could we not strop? could you not strop? could they not strop?	could I not be stropping? could you not be stropping? could he not be stropping? could we not be stropping? could you not be stropping? could they not be stropping?
Perfect	V-ing perfect
could I not have stropped? could you not have stropped? could he not have stropped? could we not have stropped? could you not have stropped? could they not have stropped?	could I not have been stropping? could you not have been stropping? could he not have been stropping? could we not have been stropping? could you not have been stropping? could they not have been stropping?