English verb conjugation
CAN TOPPLE

Regular verb: topple - toppled - toppled

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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