could tongue
Regular verb: tongue - tongued- tongued

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tongue
you could tongue
she could tongue
we could tongue
you could tongue
they could tongue 	I could be tonguing
you could be tonguing
she could be tonguing
we could be tonguing
you could be tonguing
they could be tonguing	I could have tongued
you could have tongued
she 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
she 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 couldn't tongue
you couldn't tongue
she couldn't tongue
we couldn't tongue
you couldn't tongue
they couldn't tongue 	I couldn't be tonguing
you couldn't be tonguing
she couldn't be tonguing
we couldn't be tonguing
you couldn't be tonguing
they couldn't be tonguing	I couldn't have tongued
you couldn't have tongued
she couldn't have tongued
we couldn't have tongued
you couldn't have tongued
they couldn't have tongued	I couldn't have been tonguing
you couldn't have been tonguing
she couldn't have been tonguing
we couldn't have been tonguing
you couldn't have been tonguing
they couldn't have been tonguing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tongue?
could you tongue?
could she tongue?
could we tongue?
could you tongue?
could they tongue? 	could I be tonguing?
could you be tonguing?
could she be tonguing?
could we be tonguing?
could you be tonguing?
could they be tonguing? 	could I have tongued?
could you have tongued?
could she 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 she 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 	
couldn't I tongue?
couldn't you tongue?
couldn't she tongue?
couldn't we tongue?
couldn't you tongue?
couldn't they tongue? 	couldn't I be tonguing?
couldn't you be tonguing?
couldn't she be tonguing?
couldn't we be tonguing?
couldn't you be tonguing?
couldn't they be tonguing? 	couldn't I have tongued?
couldn't you have tongued?
couldn't she have tongued?
couldn't we have tongued?
couldn't you have tongued?
couldn't they have tongued? 	couldn't I have been tonguing?
couldn't you have been tonguing?
couldn't she have been tonguing?
couldn't we have been tonguing?
couldn't you have been tonguing?
couldn't they have been tonguing?