could peruse
Regular verb: peruse - perused- perused

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could peruse
you could peruse
he could peruse
we could peruse
you could peruse
they could peruse 	I could be perusing
you could be perusing
he could be perusing
we could be perusing
you could be perusing
they could be perusing	I could have perused
you could have perused
he could have perused
we could have perused
you could have perused
they could have perused	I could have been perusing
you could have been perusing
he could have been perusing
we could have been perusing
you could have been perusing
they could have been perusing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not peruse
you could not peruse
he could not peruse
we could not peruse
you could not peruse
they could not peruse 	I could not be perusing
you could not be perusing
he could not be perusing
we could not be perusing
you could not be perusing
they could not be perusing	I could not have perused
you could not have perused
he could not have perused
we could not have perused
you could not have perused
they could not have perused	I could not have been perusing
you could not have been perusing
he could not have been perusing
we could not have been perusing
you could not have been perusing
they could not have been perusing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I peruse?
could you peruse?
could he peruse?
could we peruse?
could you peruse?
could they peruse? 	could I be perusing?
could you be perusing?
could he be perusing?
could we be perusing?
could you be perusing?
could they be perusing? 	could I have perused?
could you have perused?
could he have perused?
could we have perused?
could you have perused?
could they have perused? 	could I have been perusing?
could you have been perusing?
could he have been perusing?
could we have been perusing?
could you have been perusing?
could they have been perusing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not peruse?
could you not peruse?
could he not peruse?
could we not peruse?
could you not peruse?
could they not peruse? 	could I not be perusing?
could you not be perusing?
could he not be perusing?
could we not be perusing?
could you not be perusing?
could they not be perusing? 	could I not have perused?
could you not have perused?
could he not have perused?
could we not have perused?
could you not have perused?
could they not have perused? 	could I not have been perusing?
could you not have been perusing?
could he not have been perusing?
could we not have been perusing?
could you not have been perusing?
could they not have been perusing?