could rig
Regular verb: rig - rigged- rigged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could rig
you could rig
he could rig
we could rig
you could rig
they could rig 	I could be rigging
you could be rigging
he could be rigging
we could be rigging
you could be rigging
they could be rigging	I could have rigged
you could have rigged
he could have rigged
we could have rigged
you could have rigged
they could have rigged	I could have been rigging
you could have been rigging
he could have been rigging
we could have been rigging
you could have been rigging
they could have been rigging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't rig
you couldn't rig
he couldn't rig
we couldn't rig
you couldn't rig
they couldn't rig 	I couldn't be rigging
you couldn't be rigging
he couldn't be rigging
we couldn't be rigging
you couldn't be rigging
they couldn't be rigging	I couldn't have rigged
you couldn't have rigged
he couldn't have rigged
we couldn't have rigged
you couldn't have rigged
they couldn't have rigged	I couldn't have been rigging
you couldn't have been rigging
he couldn't have been rigging
we couldn't have been rigging
you couldn't have been rigging
they couldn't have been rigging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I rig?
could you rig?
could he rig?
could we rig?
could you rig?
could they rig? 	could I be rigging?
could you be rigging?
could he be rigging?
could we be rigging?
could you be rigging?
could they be rigging? 	could I have rigged?
could you have rigged?
could he have rigged?
could we have rigged?
could you have rigged?
could they have rigged? 	could I have been rigging?
could you have been rigging?
could he have been rigging?
could we have been rigging?
could you have been rigging?
could they have been rigging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I rig?
couldn't you rig?
couldn't he rig?
couldn't we rig?
couldn't you rig?
couldn't they rig? 	couldn't I be rigging?
couldn't you be rigging?
couldn't he be rigging?
couldn't we be rigging?
couldn't you be rigging?
couldn't they be rigging? 	couldn't I have rigged?
couldn't you have rigged?
couldn't he have rigged?
couldn't we have rigged?
couldn't you have rigged?
couldn't they have rigged? 	couldn't I have been rigging?
couldn't you have been rigging?
couldn't he have been rigging?
couldn't we have been rigging?
couldn't you have been rigging?
couldn't they have been rigging?