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