could tag
Regular verb: tag - tagged- tagged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tag
you could tag
he could tag
we could tag
you could tag
they could tag 	I could be tagging
you could be tagging
he could be tagging
we could be tagging
you could be tagging
they could be tagging	I could have tagged
you could have tagged
he could have tagged
we could have tagged
you could have tagged
they could have tagged	I could have been tagging
you could have been tagging
he could have been tagging
we could have been tagging
you could have been tagging
they could have been tagging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tag
you couldn't tag
he couldn't tag
we couldn't tag
you couldn't tag
they couldn't tag 	I couldn't be tagging
you couldn't be tagging
he couldn't be tagging
we couldn't be tagging
you couldn't be tagging
they couldn't be tagging	I couldn't have tagged
you couldn't have tagged
he couldn't have tagged
we couldn't have tagged
you couldn't have tagged
they couldn't have tagged	I couldn't have been tagging
you couldn't have been tagging
he couldn't have been tagging
we couldn't have been tagging
you couldn't have been tagging
they couldn't have been tagging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tag?
could you tag?
could he tag?
could we tag?
could you tag?
could they tag? 	could I be tagging?
could you be tagging?
could he be tagging?
could we be tagging?
could you be tagging?
could they be tagging? 	could I have tagged?
could you have tagged?
could he have tagged?
could we have tagged?
could you have tagged?
could they have tagged? 	could I have been tagging?
could you have been tagging?
could he have been tagging?
could we have been tagging?
could you have been tagging?
could they have been tagging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tag?
couldn't you tag?
couldn't he tag?
couldn't we tag?
couldn't you tag?
couldn't they tag? 	couldn't I be tagging?
couldn't you be tagging?
couldn't he be tagging?
couldn't we be tagging?
couldn't you be tagging?
couldn't they be tagging? 	couldn't I have tagged?
couldn't you have tagged?
couldn't he have tagged?
couldn't we have tagged?
couldn't you have tagged?
couldn't they have tagged? 	couldn't I have been tagging?
couldn't you have been tagging?
couldn't he have been tagging?
couldn't we have been tagging?
couldn't you have been tagging?
couldn't they have been tagging?