should penetrate
Regular verb: penetrate - penetrated- penetrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd penetrate
you'd penetrate
he'd penetrate
we'd penetrate
you'd penetrate
they'd penetrate 	I'd be penetrating
you'd be penetrating
he'd be penetrating
we'd be penetrating
you'd be penetrating
they'd be penetrating	I should've penetrated
you should've penetrated
he should've penetrated
we should've penetrated
you should've penetrated
they should've penetrated	I should've been penetrating
you should've been penetrating
he should've been penetrating
we should've been penetrating
you should've been penetrating
they should've been penetrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't penetrate
you shouldn't penetrate
he shouldn't penetrate
we shouldn't penetrate
you shouldn't penetrate
they shouldn't penetrate 	I shouldn't be penetrating
you shouldn't be penetrating
he shouldn't be penetrating
we shouldn't be penetrating
you shouldn't be penetrating
they shouldn't be penetrating	I shouldn't have penetrated
you shouldn't have penetrated
he shouldn't have penetrated
we shouldn't have penetrated
you shouldn't have penetrated
they shouldn't have penetrated	I shouldn't have been penetrating
you shouldn't have been penetrating
he shouldn't have been penetrating
we shouldn't have been penetrating
you shouldn't have been penetrating
they shouldn't have been penetrating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I penetrate?
should you penetrate?
should he penetrate?
should we penetrate?
should you penetrate?
should they penetrate? 	should I be penetrating?
should you be penetrating?
should he be penetrating?
should we be penetrating?
should you be penetrating?
should they be penetrating? 	should I have penetrated?
should you have penetrated?
should he have penetrated?
should we have penetrated?
should you have penetrated?
should they have penetrated? 	should I have been penetrating?
should you have been penetrating?
should he have been penetrating?
should we have been penetrating?
should you have been penetrating?
should they have been penetrating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I penetrate?
shouldn't you penetrate?
shouldn't he penetrate?
shouldn't we penetrate?
shouldn't you penetrate?
shouldn't they penetrate? 	shouldn't I be penetrating?
shouldn't you be penetrating?
shouldn't he be penetrating?
shouldn't we be penetrating?
shouldn't you be penetrating?
shouldn't they be penetrating? 	shouldn't I have penetrated?
shouldn't you have penetrated?
shouldn't he have penetrated?
shouldn't we have penetrated?
shouldn't you have penetrated?
shouldn't they have penetrated? 	shouldn't I have been penetrating?
shouldn't you have been penetrating?
shouldn't he have been penetrating?
shouldn't we have been penetrating?
shouldn't you have been penetrating?
shouldn't they have been penetrating?