can modulate
Regular verb: modulate - modulated- modulated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can modulate
you can modulate
he can modulate
we can modulate
you can modulate
they can modulate 	I can be modulating
you can be modulating
he can be modulating
we can be modulating
you can be modulating
they can be modulating	I can have modulated
you can have modulated
he can have modulated
we can have modulated
you can have modulated
they can have modulated	I can have been modulating
you can have been modulating
he can have been modulating
we can have been modulating
you can have been modulating
they can have been modulating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot modulate
you cannot modulate
he cannot modulate
we cannot modulate
you cannot modulate
they cannot modulate 	I cannot be modulating
you cannot be modulating
he cannot be modulating
we cannot be modulating
you cannot be modulating
they cannot be modulating	I cannot have modulated
you cannot have modulated
he cannot have modulated
we cannot have modulated
you cannot have modulated
they cannot have modulated	I cannot have been modulating
you cannot have been modulating
he cannot have been modulating
we cannot have been modulating
you cannot have been modulating
they cannot have been modulating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I modulate?
can you modulate?
can he modulate?
can we modulate?
can you modulate?
can they modulate? 	can I be modulating?
can you be modulating?
can he be modulating?
can we be modulating?
can you be modulating?
can they be modulating? 	can I have modulated?
can you have modulated?
can he have modulated?
can we have modulated?
can you have modulated?
can they have modulated? 	can I have been modulating?
can you have been modulating?
can he have been modulating?
can we have been modulating?
can you have been modulating?
can they have been modulating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not modulate?
can you not modulate?
can he not modulate?
can we not modulate?
can you not modulate?
can they not modulate? 	can I not be modulating?
can you not be modulating?
can he not be modulating?
can we not be modulating?
can you not be modulating?
can they not be modulating? 	can I not have modulated?
can you not have modulated?
can he not have modulated?
can we not have modulated?
can you not have modulated?
can they not have modulated? 	can I not have been modulating?
can you not have been modulating?
can he not have been modulating?
can we not have been modulating?
can you not have been modulating?
can they not have been modulating?