can penetrate
Regular verb: penetrate - penetrated- penetrated

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

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

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

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