could zag
Regular verb: zag - zaged- zaged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could zag
you could zag
she could zag
we could zag
you could zag
they could zag 	I could be zaging
you could be zaging
she could be zaging
we could be zaging
you could be zaging
they could be zaging	I could have zaged
you could have zaged
she 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
she 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 couldn't zag
you couldn't zag
she couldn't zag
we couldn't zag
you couldn't zag
they couldn't zag 	I couldn't be zaging
you couldn't be zaging
she couldn't be zaging
we couldn't be zaging
you couldn't be zaging
they couldn't be zaging	I couldn't have zaged
you couldn't have zaged
she couldn't have zaged
we couldn't have zaged
you couldn't have zaged
they couldn't have zaged	I couldn't have been zaging
you couldn't have been zaging
she couldn't have been zaging
we couldn't have been zaging
you couldn't have been zaging
they couldn't have been zaging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I zag?
could you zag?
could she zag?
could we zag?
could you zag?
could they zag? 	could I be zaging?
could you be zaging?
could she be zaging?
could we be zaging?
could you be zaging?
could they be zaging? 	could I have zaged?
could you have zaged?
could she 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 she 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 	
couldn't I zag?
couldn't you zag?
couldn't she zag?
couldn't we zag?
couldn't you zag?
couldn't they zag? 	couldn't I be zaging?
couldn't you be zaging?
couldn't she be zaging?
couldn't we be zaging?
couldn't you be zaging?
couldn't they be zaging? 	couldn't I have zaged?
couldn't you have zaged?
couldn't she have zaged?
couldn't we have zaged?
couldn't you have zaged?
couldn't they have zaged? 	couldn't I have been zaging?
couldn't you have been zaging?
couldn't she have been zaging?
couldn't we have been zaging?
couldn't you have been zaging?
couldn't they have been zaging?