could zigzag
Regular verb: zigzag - zigzagged- zigzagged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could zigzag
you could zigzag
she could zigzag
we could zigzag
you could zigzag
they could zigzag 	I could be zigzagging
you could be zigzagging
she could be zigzagging
we could be zigzagging
you could be zigzagging
they could be zigzagging	I could have zigzagged
you could have zigzagged
she could have zigzagged
we could have zigzagged
you could have zigzagged
they could have zigzagged	I could have been zigzagging
you could have been zigzagging
she could have been zigzagging
we could have been zigzagging
you could have been zigzagging
they could have been zigzagging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't zigzag
you couldn't zigzag
she couldn't zigzag
we couldn't zigzag
you couldn't zigzag
they couldn't zigzag 	I couldn't be zigzagging
you couldn't be zigzagging
she couldn't be zigzagging
we couldn't be zigzagging
you couldn't be zigzagging
they couldn't be zigzagging	I couldn't have zigzagged
you couldn't have zigzagged
she couldn't have zigzagged
we couldn't have zigzagged
you couldn't have zigzagged
they couldn't have zigzagged	I couldn't have been zigzagging
you couldn't have been zigzagging
she couldn't have been zigzagging
we couldn't have been zigzagging
you couldn't have been zigzagging
they couldn't have been zigzagging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I zigzag?
could you zigzag?
could she zigzag?
could we zigzag?
could you zigzag?
could they zigzag? 	could I be zigzagging?
could you be zigzagging?
could she be zigzagging?
could we be zigzagging?
could you be zigzagging?
could they be zigzagging? 	could I have zigzagged?
could you have zigzagged?
could she have zigzagged?
could we have zigzagged?
could you have zigzagged?
could they have zigzagged? 	could I have been zigzagging?
could you have been zigzagging?
could she have been zigzagging?
could we have been zigzagging?
could you have been zigzagging?
could they have been zigzagging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I zigzag?
couldn't you zigzag?
couldn't she zigzag?
couldn't we zigzag?
couldn't you zigzag?
couldn't they zigzag? 	couldn't I be zigzagging?
couldn't you be zigzagging?
couldn't she be zigzagging?
couldn't we be zigzagging?
couldn't you be zigzagging?
couldn't they be zigzagging? 	couldn't I have zigzagged?
couldn't you have zigzagged?
couldn't she have zigzagged?
couldn't we have zigzagged?
couldn't you have zigzagged?
couldn't they have zigzagged? 	couldn't I have been zigzagging?
couldn't you have been zigzagging?
couldn't she have been zigzagging?
couldn't we have been zigzagging?
couldn't you have been zigzagging?
couldn't they have been zigzagging?