I can pet you can pet he can pet we can pet you can pet they can pet
V-ing form
I can be petting you can be petting he can be petting we can be petting you can be petting they can be petting
Perfect
I can have petted you can have petted he can have petted we can have petted you can have petted they can have petted
V-ing perfect
I can have been petting you can have been petting he can have been petting we can have been petting you can have been petting they can have been petting
Negation
Simple form
I cannot pet you cannot pet he cannot pet we cannot pet you cannot pet they cannot pet
V-ing form
I cannot be petting you cannot be petting he cannot be petting we cannot be petting you cannot be petting they cannot be petting
Perfect
I cannot have petted you cannot have petted he cannot have petted we cannot have petted you cannot have petted they cannot have petted
V-ing perfect
I cannot have been petting you cannot have been petting he cannot have been petting we cannot have been petting you cannot have been petting they cannot have been petting
Interrogative form
Simple form
can I pet? can you pet? can he pet? can we pet? can you pet? can they pet?
V-ing form
can I be petting? can you be petting? can he be petting? can we be petting? can you be petting? can they be petting?
Perfect
can I have petted? can you have petted? can he have petted? can we have petted? can you have petted? can they have petted?
V-ing perfect
can I have been petting? can you have been petting? can he have been petting? can we have been petting? can you have been petting? can they have been petting?
Interro-negative form
Simple form
can I not pet? can you not pet? can he not pet? can we not pet? can you not pet? can they not pet?
V-ing form
can I not be petting? can you not be petting? can he not be petting? can we not be petting? can you not be petting? can they not be petting?
Perfect
can I not have petted? can you not have petted? can he not have petted? can we not have petted? can you not have petted? can they not have petted?
V-ing perfect
can I not have been petting? can you not have been petting? can he not have been petting? can we not have been petting? can you not have been petting? can they not have been petting?