I could imagine you could imagine she could imagine we could imagine you could imagine they could imagine
V-ing form
I could be imagining you could be imagining she could be imagining we could be imagining you could be imagining they could be imagining
Perfect
I could have imagined you could have imagined she 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 she 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 she 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 she 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 she 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 she 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 she imagine? could we imagine? could you imagine? could they imagine?
V-ing form
could I be imagining? could you be imagining? could she be imagining? could we be imagining? could you be imagining? could they be imagining?
Perfect
could I have imagined? could you have imagined? could she 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 she 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 she 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 she 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 she 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 she have been imagining? couldn't we have been imagining? couldn't you have been imagining? couldn't they have been imagining?