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