English verb conjugation
SHOULD RUB

Regular verb: rub - rubbed - rubbed

Affirmation

Simple form	V-ing form
I'd rub you'd rub he'd rub we'd rub you'd rub they'd rub	I'd be rubbing you'd be rubbing he'd be rubbing we'd be rubbing you'd be rubbing they'd be rubbing
Perfect	V-ing perfect
I should've rubbed you should've rubbed he should've rubbed we should've rubbed you should've rubbed they should've rubbed	I should've been rubbing you should've been rubbing he should've been rubbing we should've been rubbing you should've been rubbing they should've been rubbing

Negation

Simple form	V-ing form
I shouldn't rub you shouldn't rub he shouldn't rub we shouldn't rub you shouldn't rub they shouldn't rub	I shouldn't be rubbing you shouldn't be rubbing he shouldn't be rubbing we shouldn't be rubbing you shouldn't be rubbing they shouldn't be rubbing
Perfect	V-ing perfect
I shouldn't have rubbed you shouldn't have rubbed he shouldn't have rubbed we shouldn't have rubbed you shouldn't have rubbed they shouldn't have rubbed	I shouldn't have been rubbing you shouldn't have been rubbing he shouldn't have been rubbing we shouldn't have been rubbing you shouldn't have been rubbing they shouldn't have been rubbing

Interrogative form

Simple form	V-ing form
should I rub? should you rub? should he rub? should we rub? should you rub? should they rub?	should I be rubbing? should you be rubbing? should he be rubbing? should we be rubbing? should you be rubbing? should they be rubbing?
Perfect	V-ing perfect
should I have rubbed? should you have rubbed? should he have rubbed? should we have rubbed? should you have rubbed? should they have rubbed?	should I have been rubbing? should you have been rubbing? should he have been rubbing? should we have been rubbing? should you have been rubbing? should they have been rubbing?

Interro-negative form

Simple form	V-ing form
shouldn't I rub? shouldn't you rub? shouldn't he rub? shouldn't we rub? shouldn't you rub? shouldn't they rub?	shouldn't I be rubbing? shouldn't you be rubbing? shouldn't he be rubbing? shouldn't we be rubbing? shouldn't you be rubbing? shouldn't they be rubbing?
Perfect	V-ing perfect
shouldn't I have rubbed? shouldn't you have rubbed? shouldn't he have rubbed? shouldn't we have rubbed? shouldn't you have rubbed? shouldn't they have rubbed?	shouldn't I have been rubbing? shouldn't you have been rubbing? shouldn't he have been rubbing? shouldn't we have been rubbing? shouldn't you have been rubbing? shouldn't they have been rubbing?