should sub
Regular verb: sub - subbed- subbed

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not sub
you should not sub
she should not sub
we should not sub
you should not sub
they should not sub 	I should not be subbing
you should not be subbing
she should not be subbing
we should not be subbing
you should not be subbing
they should not be subbing	I should not have subbed
you should not have subbed
she should not have subbed
we should not have subbed
you should not have subbed
they should not have subbed	I should not have been subbing
you should not have been subbing
she should not have been subbing
we should not have been subbing
you should not have been subbing
they should not 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 	
should I not sub?
should you not sub?
should she not sub?
should we not sub?
should you not sub?
should they not sub? 	should I not be subbing?
should you not be subbing?
should she not be subbing?
should we not be subbing?
should you not be subbing?
should they not be subbing? 	should I not have subbed?
should you not have subbed?
should she not have subbed?
should we not have subbed?
should you not have subbed?
should they not have subbed? 	should I not have been subbing?
should you not have been subbing?
should she not have been subbing?
should we not have been subbing?
should you not have been subbing?
should they not have been subbing?