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