should penetrate
Regular verb: penetrate - penetrated- penetrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should penetrate
you should penetrate
she should penetrate
we should penetrate
you should penetrate
they should penetrate 	I should be penetrating
you should be penetrating
she should be penetrating
we should be penetrating
you should be penetrating
they should be penetrating	I should have penetrated
you should have penetrated
she should have penetrated
we should have penetrated
you should have penetrated
they should have penetrated	I should have been penetrating
you should have been penetrating
she should have been penetrating
we should have been penetrating
you should have been penetrating
they should have been penetrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not penetrate
you should not penetrate
she should not penetrate
we should not penetrate
you should not penetrate
they should not penetrate 	I should not be penetrating
you should not be penetrating
she should not be penetrating
we should not be penetrating
you should not be penetrating
they should not be penetrating	I should not have penetrated
you should not have penetrated
she should not have penetrated
we should not have penetrated
you should not have penetrated
they should not have penetrated	I should not have been penetrating
you should not have been penetrating
she should not have been penetrating
we should not have been penetrating
you should not have been penetrating
they should not 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 	
should I not penetrate?
should you not penetrate?
should she not penetrate?
should we not penetrate?
should you not penetrate?
should they not penetrate? 	should I not be penetrating?
should you not be penetrating?
should she not be penetrating?
should we not be penetrating?
should you not be penetrating?
should they not be penetrating? 	should I not have penetrated?
should you not have penetrated?
should she not have penetrated?
should we not have penetrated?
should you not have penetrated?
should they not have penetrated? 	should I not have been penetrating?
should you not have been penetrating?
should she not have been penetrating?
should we not have been penetrating?
should you not have been penetrating?
should they not have been penetrating?