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