English verb conjugation
SHOULD SUB

Regular verb: sub - subbed - subbed

Affirmation

Simple form	V-ing form
I'd sub you'd sub he'd sub we'd sub you'd sub they'd sub	I'd be subbing you'd be subbing he'd be subbing we'd be subbing you'd be subbing they'd be subbing
Perfect	V-ing perfect
I should've subbed you should've subbed he should've subbed we should've subbed you should've subbed they should've subbed	I should've been subbing you should've been subbing he should've been subbing we should've been subbing you should've been subbing they should've been subbing

Negation

Simple form	V-ing form
I shouldn't sub you shouldn't sub he shouldn't sub we shouldn't sub you shouldn't sub they shouldn't sub	I shouldn't be subbing you shouldn't be subbing he shouldn't be subbing we shouldn't be subbing you shouldn't be subbing they shouldn't be subbing
Perfect	V-ing perfect
I shouldn't have subbed you shouldn't have subbed he shouldn't have subbed we shouldn't have subbed you shouldn't have subbed they shouldn't have subbed	I shouldn't have been subbing you shouldn't have been subbing he shouldn't have been subbing we shouldn't have been subbing you shouldn't have been subbing they shouldn't have been subbing

Interrogative form

Simple form	V-ing form
should I sub? should you sub? should he sub? should we sub? should you sub? should they sub?	should I be subbing? should you be subbing? should he be subbing? should we be subbing? should you be subbing? should they be subbing?
Perfect	V-ing perfect
should I have subbed? should you have subbed? should he have subbed? should we have subbed? should you have subbed? should they have subbed?	should I have been subbing? should you have been subbing? should he have been subbing? should we have been subbing? should you have been subbing? should they have been subbing?

Interro-negative form

Simple form	V-ing form
shouldn't I sub? shouldn't you sub? shouldn't he sub? shouldn't we sub? shouldn't you sub? shouldn't they sub?	shouldn't I be subbing? shouldn't you be subbing? shouldn't he be subbing? shouldn't we be subbing? shouldn't you be subbing? shouldn't they be subbing?
Perfect	V-ing perfect
shouldn't I have subbed? shouldn't you have subbed? shouldn't he have subbed? shouldn't we have subbed? shouldn't you have subbed? shouldn't they have subbed?	shouldn't I have been subbing? shouldn't you have been subbing? shouldn't he have been subbing? shouldn't we have been subbing? shouldn't you have been subbing? shouldn't they have been subbing?