English verb conjugation
COULD PLOP

Regular verb: plop - plopped - plopped

Affirmation

Simple form	V-ing form
I could plop you could plop he could plop we could plop you could plop they could plop	I could be plopping you could be plopping he could be plopping we could be plopping you could be plopping they could be plopping
Perfect	V-ing perfect
I could have plopped you could have plopped he could have plopped we could have plopped you could have plopped they could have plopped	I could have been plopping you could have been plopping he could have been plopping we could have been plopping you could have been plopping they could have been plopping

Negation

Simple form	V-ing form
I could not plop you could not plop he could not plop we could not plop you could not plop they could not plop	I could not be plopping you could not be plopping he could not be plopping we could not be plopping you could not be plopping they could not be plopping
Perfect	V-ing perfect
I could not have plopped you could not have plopped he could not have plopped we could not have plopped you could not have plopped they could not have plopped	I could not have been plopping you could not have been plopping he could not have been plopping we could not have been plopping you could not have been plopping they could not have been plopping

Interrogative form

Simple form	V-ing form
could I plop? could you plop? could he plop? could we plop? could you plop? could they plop?	could I be plopping? could you be plopping? could he be plopping? could we be plopping? could you be plopping? could they be plopping?
Perfect	V-ing perfect
could I have plopped? could you have plopped? could he have plopped? could we have plopped? could you have plopped? could they have plopped?	could I have been plopping? could you have been plopping? could he have been plopping? could we have been plopping? could you have been plopping? could they have been plopping?

Interro-negative form

Simple form	V-ing form
could I not plop? could you not plop? could he not plop? could we not plop? could you not plop? could they not plop?	could I not be plopping? could you not be plopping? could he not be plopping? could we not be plopping? could you not be plopping? could they not be plopping?
Perfect	V-ing perfect
could I not have plopped? could you not have plopped? could he not have plopped? could we not have plopped? could you not have plopped? could they not have plopped?	could I not have been plopping? could you not have been plopping? could he not have been plopping? could we not have been plopping? could you not have been plopping? could they not have been plopping?