could zag
Regular verb: zag - zaged- zaged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could zag
you could zag
he could zag
we could zag
you could zag
they could zag 	I could be zaging
you could be zaging
he could be zaging
we could be zaging
you could be zaging
they could be zaging	I could have zaged
you could have zaged
he could have zaged
we could have zaged
you could have zaged
they could have zaged	I could have been zaging
you could have been zaging
he could have been zaging
we could have been zaging
you could have been zaging
they could have been zaging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not zag
you could not zag
he could not zag
we could not zag
you could not zag
they could not zag 	I could not be zaging
you could not be zaging
he could not be zaging
we could not be zaging
you could not be zaging
they could not be zaging	I could not have zaged
you could not have zaged
he could not have zaged
we could not have zaged
you could not have zaged
they could not have zaged	I could not have been zaging
you could not have been zaging
he could not have been zaging
we could not have been zaging
you could not have been zaging
they could not have been zaging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I zag?
could you zag?
could he zag?
could we zag?
could you zag?
could they zag? 	could I be zaging?
could you be zaging?
could he be zaging?
could we be zaging?
could you be zaging?
could they be zaging? 	could I have zaged?
could you have zaged?
could he have zaged?
could we have zaged?
could you have zaged?
could they have zaged? 	could I have been zaging?
could you have been zaging?
could he have been zaging?
could we have been zaging?
could you have been zaging?
could they have been zaging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not zag?
could you not zag?
could he not zag?
could we not zag?
could you not zag?
could they not zag? 	could I not be zaging?
could you not be zaging?
could he not be zaging?
could we not be zaging?
could you not be zaging?
could they not be zaging? 	could I not have zaged?
could you not have zaged?
could he not have zaged?
could we not have zaged?
could you not have zaged?
could they not have zaged? 	could I not have been zaging?
could you not have been zaging?
could he not have been zaging?
could we not have been zaging?
could you not have been zaging?
could they not have been zaging?