English verb conjugation
COULD PET

Regular verb: pet - petted - petted

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

Simple form	V-ing form
couldn't I pet? couldn't you pet? couldn't she pet? couldn't we pet? couldn't you pet? couldn't they pet?	couldn't I be petting? couldn't you be petting? couldn't she be petting? couldn't we be petting? couldn't you be petting? couldn't they be petting?
Perfect	V-ing perfect
couldn't I have petted? couldn't you have petted? couldn't she have petted? couldn't we have petted? couldn't you have petted? couldn't they have petted?	couldn't I have been petting? couldn't you have been petting? couldn't she have been petting? couldn't we have been petting? couldn't you have been petting? couldn't they have been petting?