I could scavenge you could scavenge he could scavenge we could scavenge you could scavenge they could scavenge
V-ing form
I could be scavenging you could be scavenging he could be scavenging we could be scavenging you could be scavenging they could be scavenging
Perfect
I could have scavenged you could have scavenged he 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 he 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 he 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 he 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 he 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 he 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 he scavenge? could we scavenge? could you scavenge? could they scavenge?
V-ing form
could I be scavenging? could you be scavenging? could he be scavenging? could we be scavenging? could you be scavenging? could they be scavenging?
Perfect
could I have scavenged? could you have scavenged? could he 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 he 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 he 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 he 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 he 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 he have been scavenging? couldn't we have been scavenging? couldn't you have been scavenging? couldn't they have been scavenging?