should stab
Regular verb: stab - stabbed- stabbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should stab
you should stab
he should stab
we should stab
you should stab
they should stab 	I should be stabbing
you should be stabbing
he should be stabbing
we should be stabbing
you should be stabbing
they should be stabbing	I should have stabbed
you should have stabbed
he should have stabbed
we should have stabbed
you should have stabbed
they should have stabbed	I should have been stabbing
you should have been stabbing
he should have been stabbing
we should have been stabbing
you should have been stabbing
they should have been stabbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not stab
you should not stab
he should not stab
we should not stab
you should not stab
they should not stab 	I should not be stabbing
you should not be stabbing
he should not be stabbing
we should not be stabbing
you should not be stabbing
they should not be stabbing	I should not have stabbed
you should not have stabbed
he should not have stabbed
we should not have stabbed
you should not have stabbed
they should not have stabbed	I should not have been stabbing
you should not have been stabbing
he should not have been stabbing
we should not have been stabbing
you should not have been stabbing
they should not have been stabbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I stab?
should you stab?
should he stab?
should we stab?
should you stab?
should they stab? 	should I be stabbing?
should you be stabbing?
should he be stabbing?
should we be stabbing?
should you be stabbing?
should they be stabbing? 	should I have stabbed?
should you have stabbed?
should he have stabbed?
should we have stabbed?
should you have stabbed?
should they have stabbed? 	should I have been stabbing?
should you have been stabbing?
should he have been stabbing?
should we have been stabbing?
should you have been stabbing?
should they have been stabbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not stab?
should you not stab?
should he not stab?
should we not stab?
should you not stab?
should they not stab? 	should I not be stabbing?
should you not be stabbing?
should he not be stabbing?
should we not be stabbing?
should you not be stabbing?
should they not be stabbing? 	should I not have stabbed?
should you not have stabbed?
should he not have stabbed?
should we not have stabbed?
should you not have stabbed?
should they not have stabbed? 	should I not have been stabbing?
should you not have been stabbing?
should he not have been stabbing?
should we not have been stabbing?
should you not have been stabbing?
should they not have been stabbing?