should penetrate
Regular verb: penetrate - penetrated- penetrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd penetrate
you'd penetrate
she'd penetrate
we'd penetrate
you'd penetrate
they'd penetrate 	I'd be penetrating
you'd be penetrating
she'd be penetrating
we'd be penetrating
you'd be penetrating
they'd be penetrating	I should've penetrated
you should've penetrated
she 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
she 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
she 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
she 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
she 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
she 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 she penetrate?
should we penetrate?
should you penetrate?
should they penetrate? 	should I be penetrating?
should you be penetrating?
should she be penetrating?
should we be penetrating?
should you be penetrating?
should they be penetrating? 	should I have penetrated?
should you have penetrated?
should she 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 she 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 she 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 she 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 she 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 she have been penetrating?
shouldn't we have been penetrating?
shouldn't you have been penetrating?
shouldn't they have been penetrating?