could pass
Regular verb: pass - passed- passed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could pass
you could pass
she could pass
we could pass
you could pass
they could pass 	I could be passing
you could be passing
she could be passing
we could be passing
you could be passing
they could be passing	I could have passed
you could have passed
she could have passed
we could have passed
you could have passed
they could have passed	I could have been passing
you could have been passing
she could have been passing
we could have been passing
you could have been passing
they could have been passing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not pass
you could not pass
she could not pass
we could not pass
you could not pass
they could not pass 	I could not be passing
you could not be passing
she could not be passing
we could not be passing
you could not be passing
they could not be passing	I could not have passed
you could not have passed
she could not have passed
we could not have passed
you could not have passed
they could not have passed	I could not have been passing
you could not have been passing
she could not have been passing
we could not have been passing
you could not have been passing
they could not have been passing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I pass?
could you pass?
could she pass?
could we pass?
could you pass?
could they pass? 	could I be passing?
could you be passing?
could she be passing?
could we be passing?
could you be passing?
could they be passing? 	could I have passed?
could you have passed?
could she have passed?
could we have passed?
could you have passed?
could they have passed? 	could I have been passing?
could you have been passing?
could she have been passing?
could we have been passing?
could you have been passing?
could they have been passing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not pass?
could you not pass?
could she not pass?
could we not pass?
could you not pass?
could they not pass? 	could I not be passing?
could you not be passing?
could she not be passing?
could we not be passing?
could you not be passing?
could they not be passing? 	could I not have passed?
could you not have passed?
could she not have passed?
could we not have passed?
could you not have passed?
could they not have passed? 	could I not have been passing?
could you not have been passing?
could she not have been passing?
could we not have been passing?
could you not have been passing?
could they not have been passing?