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 can't pet you can't pet he can't pet we can't pet you can't pet they can't pet
V-ing form
I can't be petting you can't be petting he can't be petting we can't be petting you can't be petting they can't be petting
Perfect
I can't have petted you can't have petted he can't have petted we can't have petted you can't have petted they can't have petted
V-ing perfect
I can't have been petting you can't have been petting he can't have been petting we can't have been petting you can't have been petting they can't 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't I pet? can't you pet? can't he pet? can't we pet? can't you pet? can't they pet?
V-ing form
can't I be petting? can't you be petting? can't he be petting? can't we be petting? can't you be petting? can't they be petting?
Perfect
can't I have petted? can't you have petted? can't he have petted? can't we have petted? can't you have petted? can't they have petted?
V-ing perfect
can't I have been petting? can't you have been petting? can't he have been petting? can't we have been petting? can't you have been petting? can't they have been petting?