should sub
Regular verb: sub - subbed- subbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd sub
you'd sub
she'd sub
we'd sub
you'd sub
they'd sub 	I'd be subbing
you'd be subbing
she'd be subbing
we'd be subbing
you'd be subbing
they'd be subbing	I should've subbed
you should've subbed
she 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
she 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 	Perfect 	V-ing perfect 	
I shouldn't sub
you shouldn't sub
she 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
she shouldn't be subbing
we shouldn't be subbing
you shouldn't be subbing
they shouldn't be subbing	I shouldn't have subbed
you shouldn't have subbed
she 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
she 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 	Perfect 	V-ing perfect 	
should I sub?
should you sub?
should she sub?
should we sub?
should you sub?
should they sub? 	should I be subbing?
should you be subbing?
should she be subbing?
should we be subbing?
should you be subbing?
should they be subbing? 	should I have subbed?
should you have subbed?
should she 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 she 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 	Perfect 	V-ing perfect 	
shouldn't I sub?
shouldn't you sub?
shouldn't she 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 she be subbing?
shouldn't we be subbing?
shouldn't you be subbing?
shouldn't they be subbing? 	shouldn't I have subbed?
shouldn't you have subbed?
shouldn't she 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 she have been subbing?
shouldn't we have been subbing?
shouldn't you have been subbing?
shouldn't they have been subbing?