could tongue
Regular verb: tongue - tongued- tongued

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tongue
you could tongue
he could tongue
we could tongue
you could tongue
they could tongue 	I could be tonguing
you could be tonguing
he could be tonguing
we could be tonguing
you could be tonguing
they could be tonguing	I could have tongued
you could have tongued
he could have tongued
we could have tongued
you could have tongued
they could have tongued	I could have been tonguing
you could have been tonguing
he could have been tonguing
we could have been tonguing
you could have been tonguing
they could have been tonguing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not tongue
you could not tongue
he could not tongue
we could not tongue
you could not tongue
they could not tongue 	I could not be tonguing
you could not be tonguing
he could not be tonguing
we could not be tonguing
you could not be tonguing
they could not be tonguing	I could not have tongued
you could not have tongued
he could not have tongued
we could not have tongued
you could not have tongued
they could not have tongued	I could not have been tonguing
you could not have been tonguing
he could not have been tonguing
we could not have been tonguing
you could not have been tonguing
they could not have been tonguing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tongue?
could you tongue?
could he tongue?
could we tongue?
could you tongue?
could they tongue? 	could I be tonguing?
could you be tonguing?
could he be tonguing?
could we be tonguing?
could you be tonguing?
could they be tonguing? 	could I have tongued?
could you have tongued?
could he have tongued?
could we have tongued?
could you have tongued?
could they have tongued? 	could I have been tonguing?
could you have been tonguing?
could he have been tonguing?
could we have been tonguing?
could you have been tonguing?
could they have been tonguing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not tongue?
could you not tongue?
could he not tongue?
could we not tongue?
could you not tongue?
could they not tongue? 	could I not be tonguing?
could you not be tonguing?
could he not be tonguing?
could we not be tonguing?
could you not be tonguing?
could they not be tonguing? 	could I not have tongued?
could you not have tongued?
could he not have tongued?
could we not have tongued?
could you not have tongued?
could they not have tongued? 	could I not have been tonguing?
could you not have been tonguing?
could he not have been tonguing?
could we not have been tonguing?
could you not have been tonguing?
could they not have been tonguing?