I could picture you could picture he could picture we could picture you could picture they could picture
V-ing form
I could be picturing you could be picturing he could be picturing we could be picturing you could be picturing they could be picturing
Perfect
I could have pictured you could have pictured he could have pictured we could have pictured you could have pictured they could have pictured
V-ing perfect
I could have been picturing you could have been picturing he could have been picturing we could have been picturing you could have been picturing they could have been picturing
Negation
Simple form
I could not picture you could not picture he could not picture we could not picture you could not picture they could not picture
V-ing form
I could not be picturing you could not be picturing he could not be picturing we could not be picturing you could not be picturing they could not be picturing
Perfect
I could not have pictured you could not have pictured he could not have pictured we could not have pictured you could not have pictured they could not have pictured
V-ing perfect
I could not have been picturing you could not have been picturing he could not have been picturing we could not have been picturing you could not have been picturing they could not have been picturing
Interrogative form
Simple form
could I picture? could you picture? could he picture? could we picture? could you picture? could they picture?
V-ing form
could I be picturing? could you be picturing? could he be picturing? could we be picturing? could you be picturing? could they be picturing?
Perfect
could I have pictured? could you have pictured? could he have pictured? could we have pictured? could you have pictured? could they have pictured?
V-ing perfect
could I have been picturing? could you have been picturing? could he have been picturing? could we have been picturing? could you have been picturing? could they have been picturing?
Interro-negative form
Simple form
could I not picture? could you not picture? could he not picture? could we not picture? could you not picture? could they not picture?
V-ing form
could I not be picturing? could you not be picturing? could he not be picturing? could we not be picturing? could you not be picturing? could they not be picturing?
Perfect
could I not have pictured? could you not have pictured? could he not have pictured? could we not have pictured? could you not have pictured? could they not have pictured?
V-ing perfect
could I not have been picturing? could you not have been picturing? could he not have been picturing? could we not have been picturing? could you not have been picturing? could they not have been picturing?