I could lug you could lug he could lug we could lug you could lug they could lug
V-ing form
I could be lugging you could be lugging he could be lugging we could be lugging you could be lugging they could be lugging
Perfect
I could have lugged you could have lugged he could have lugged we could have lugged you could have lugged they could have lugged
V-ing perfect
I could have been lugging you could have been lugging he could have been lugging we could have been lugging you could have been lugging they could have been lugging
Negation
Simple form
I couldn't lug you couldn't lug he couldn't lug we couldn't lug you couldn't lug they couldn't lug
V-ing form
I couldn't be lugging you couldn't be lugging he couldn't be lugging we couldn't be lugging you couldn't be lugging they couldn't be lugging
Perfect
I couldn't have lugged you couldn't have lugged he couldn't have lugged we couldn't have lugged you couldn't have lugged they couldn't have lugged
V-ing perfect
I couldn't have been lugging you couldn't have been lugging he couldn't have been lugging we couldn't have been lugging you couldn't have been lugging they couldn't have been lugging
Interrogative form
Simple form
could I lug? could you lug? could he lug? could we lug? could you lug? could they lug?
V-ing form
could I be lugging? could you be lugging? could he be lugging? could we be lugging? could you be lugging? could they be lugging?
Perfect
could I have lugged? could you have lugged? could he have lugged? could we have lugged? could you have lugged? could they have lugged?
V-ing perfect
could I have been lugging? could you have been lugging? could he have been lugging? could we have been lugging? could you have been lugging? could they have been lugging?
Interro-negative form
Simple form
couldn't I lug? couldn't you lug? couldn't he lug? couldn't we lug? couldn't you lug? couldn't they lug?
V-ing form
couldn't I be lugging? couldn't you be lugging? couldn't he be lugging? couldn't we be lugging? couldn't you be lugging? couldn't they be lugging?
Perfect
couldn't I have lugged? couldn't you have lugged? couldn't he have lugged? couldn't we have lugged? couldn't you have lugged? couldn't they have lugged?
V-ing perfect
couldn't I have been lugging? couldn't you have been lugging? couldn't he have been lugging? couldn't we have been lugging? couldn't you have been lugging? couldn't they have been lugging?