English verb conjugation
COULD TOPPLE

Regular verb: topple - toppled - toppled

Affirmation

Simple form	V-ing form
I could topple you could topple he could topple we could topple you could topple they could topple	I could be toppling you could be toppling he could be toppling we could be toppling you could be toppling they could be toppling
Perfect	V-ing perfect
I could have toppled you could have toppled he could have toppled we could have toppled you could have toppled they could have toppled	I could have been toppling you could have been toppling he could have been toppling we could have been toppling you could have been toppling they could have been toppling

Negation

Simple form	V-ing form
I could not topple you could not topple he could not topple we could not topple you could not topple they could not topple	I could not be toppling you could not be toppling he could not be toppling we could not be toppling you could not be toppling they could not be toppling
Perfect	V-ing perfect
I could not have toppled you could not have toppled he could not have toppled we could not have toppled you could not have toppled they could not have toppled	I could not have been toppling you could not have been toppling he could not have been toppling we could not have been toppling you could not have been toppling they could not have been toppling

Interrogative form

Simple form	V-ing form
could I topple? could you topple? could he topple? could we topple? could you topple? could they topple?	could I be toppling? could you be toppling? could he be toppling? could we be toppling? could you be toppling? could they be toppling?
Perfect	V-ing perfect
could I have toppled? could you have toppled? could he have toppled? could we have toppled? could you have toppled? could they have toppled?	could I have been toppling? could you have been toppling? could he have been toppling? could we have been toppling? could you have been toppling? could they have been toppling?

Interro-negative form

Simple form	V-ing form
could I not topple? could you not topple? could he not topple? could we not topple? could you not topple? could they not topple?	could I not be toppling? could you not be toppling? could he not be toppling? could we not be toppling? could you not be toppling? could they not be toppling?
Perfect	V-ing perfect
could I not have toppled? could you not have toppled? could he not have toppled? could we not have toppled? could you not have toppled? could they not have toppled?	could I not have been toppling? could you not have been toppling? could he not have been toppling? could we not have been toppling? could you not have been toppling? could they not have been toppling?