I could bag you could bag she could bag we could bag you could bag they could bag
V-ing form
I could be bagging you could be bagging she could be bagging we could be bagging you could be bagging they could be bagging
Perfect
I could have bagged you could have bagged she could have bagged we could have bagged you could have bagged they could have bagged
V-ing perfect
I could have been bagging you could have been bagging she could have been bagging we could have been bagging you could have been bagging they could have been bagging
Negation
Simple form
I couldn't bag you couldn't bag she couldn't bag we couldn't bag you couldn't bag they couldn't bag
V-ing form
I couldn't be bagging you couldn't be bagging she couldn't be bagging we couldn't be bagging you couldn't be bagging they couldn't be bagging
Perfect
I couldn't have bagged you couldn't have bagged she couldn't have bagged we couldn't have bagged you couldn't have bagged they couldn't have bagged
V-ing perfect
I couldn't have been bagging you couldn't have been bagging she couldn't have been bagging we couldn't have been bagging you couldn't have been bagging they couldn't have been bagging
Interrogative form
Simple form
could I bag? could you bag? could she bag? could we bag? could you bag? could they bag?
V-ing form
could I be bagging? could you be bagging? could she be bagging? could we be bagging? could you be bagging? could they be bagging?
Perfect
could I have bagged? could you have bagged? could she have bagged? could we have bagged? could you have bagged? could they have bagged?
V-ing perfect
could I have been bagging? could you have been bagging? could she have been bagging? could we have been bagging? could you have been bagging? could they have been bagging?
Interro-negative form
Simple form
couldn't I bag? couldn't you bag? couldn't she bag? couldn't we bag? couldn't you bag? couldn't they bag?
V-ing form
couldn't I be bagging? couldn't you be bagging? couldn't she be bagging? couldn't we be bagging? couldn't you be bagging? couldn't they be bagging?
Perfect
couldn't I have bagged? couldn't you have bagged? couldn't she have bagged? couldn't we have bagged? couldn't you have bagged? couldn't they have bagged?
V-ing perfect
couldn't I have been bagging? couldn't you have been bagging? couldn't she have been bagging? couldn't we have been bagging? couldn't you have been bagging? couldn't they have been bagging?