English verb conjugation
CAN PET

Regular verb: pet - petted - petted

Affirmation

Simple form	V-ing form
I can pet you can pet she can pet we can pet you can pet they can pet	I can be petting you can be petting she can be petting we can be petting you can be petting they can be petting
Perfect	V-ing perfect
I can have petted you can have petted she can have petted we can have petted you can have petted they can have petted	I can have been petting you can have been petting she can have been petting we can have been petting you can have been petting they can have been petting

Negation

Simple form	V-ing form
I cannot pet you cannot pet she cannot pet we cannot pet you cannot pet they cannot pet	I cannot be petting you cannot be petting she cannot be petting we cannot be petting you cannot be petting they cannot be petting
Perfect	V-ing perfect
I cannot have petted you cannot have petted she cannot have petted we cannot have petted you cannot have petted they cannot have petted	I cannot have been petting you cannot have been petting she cannot have been petting we cannot have been petting you cannot have been petting they cannot have been petting

Interrogative form

Simple form	V-ing form
can I pet? can you pet? can she pet? can we pet? can you pet? can they pet?	can I be petting? can you be petting? can she be petting? can we be petting? can you be petting? can they be petting?
Perfect	V-ing perfect
can I have petted? can you have petted? can she have petted? can we have petted? can you have petted? can they have petted?	can I have been petting? can you have been petting? can she have been petting? can we have been petting? can you have been petting? can they have been petting?

Interro-negative form

Simple form	V-ing form
can I not pet? can you not pet? can she not pet? can we not pet? can you not pet? can they not pet?	can I not be petting? can you not be petting? can she not be petting? can we not be petting? can you not be petting? can they not be petting?
Perfect	V-ing perfect
can I not have petted? can you not have petted? can she not have petted? can we not have petted? can you not have petted? can they not have petted?	can I not have been petting? can you not have been petting? can she not have been petting? can we not have been petting? can you not have been petting? can they not have been petting?