English verb conjugation
COULD STOPPLE

Regular verb: stopple - stoppled - stoppled

Affirmation

Simple form	V-ing form
I could stopple you could stopple he could stopple we could stopple you could stopple they could stopple	I could be stoppling you could be stoppling he could be stoppling we could be stoppling you could be stoppling they could be stoppling
Perfect	V-ing perfect
I could have stoppled you could have stoppled he could have stoppled we could have stoppled you could have stoppled they could have stoppled	I could have been stoppling you could have been stoppling he could have been stoppling we could have been stoppling you could have been stoppling they could have been stoppling

Negation

Simple form	V-ing form
I could not stopple you could not stopple he could not stopple we could not stopple you could not stopple they could not stopple	I could not be stoppling you could not be stoppling he could not be stoppling we could not be stoppling you could not be stoppling they could not be stoppling
Perfect	V-ing perfect
I could not have stoppled you could not have stoppled he could not have stoppled we could not have stoppled you could not have stoppled they could not have stoppled	I could not have been stoppling you could not have been stoppling he could not have been stoppling we could not have been stoppling you could not have been stoppling they could not have been stoppling

Interrogative form

Simple form	V-ing form
could I stopple? could you stopple? could he stopple? could we stopple? could you stopple? could they stopple?	could I be stoppling? could you be stoppling? could he be stoppling? could we be stoppling? could you be stoppling? could they be stoppling?
Perfect	V-ing perfect
could I have stoppled? could you have stoppled? could he have stoppled? could we have stoppled? could you have stoppled? could they have stoppled?	could I have been stoppling? could you have been stoppling? could he have been stoppling? could we have been stoppling? could you have been stoppling? could they have been stoppling?

Interro-negative form

Simple form	V-ing form
could I not stopple? could you not stopple? could he not stopple? could we not stopple? could you not stopple? could they not stopple?	could I not be stoppling? could you not be stoppling? could he not be stoppling? could we not be stoppling? could you not be stoppling? could they not be stoppling?
Perfect	V-ing perfect
could I not have stoppled? could you not have stoppled? could he not have stoppled? could we not have stoppled? could you not have stoppled? could they not have stoppled?	could I not have been stoppling? could you not have been stoppling? could he not have been stoppling? could we not have been stoppling? could you not have been stoppling? could they not have been stoppling?