English verb conjugation
COULD TAG

Regular verb: tag - tagged - tagged

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I could not tag you could not tag he could not tag we could not tag you could not tag they could not tag	I could not be tagging you could not be tagging he could not be tagging we could not be tagging you could not be tagging they could not be tagging
Perfect	V-ing perfect
I could not have tagged you could not have tagged he could not have tagged we could not have tagged you could not have tagged they could not have tagged	I could not have been tagging you could not have been tagging he could not have been tagging we could not have been tagging you could not have been tagging they could not have been tagging

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
could I not tag? could you not tag? could he not tag? could we not tag? could you not tag? could they not tag?	could I not be tagging? could you not be tagging? could he not be tagging? could we not be tagging? could you not be tagging? could they not be tagging?
Perfect	V-ing perfect
could I not have tagged? could you not have tagged? could he not have tagged? could we not have tagged? could you not have tagged? could they not have tagged?	could I not have been tagging? could you not have been tagging? could he not have been tagging? could we not have been tagging? could you not have been tagging? could they not have been tagging?