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 couldn't picture you couldn't picture he couldn't picture we couldn't picture you couldn't picture they couldn't picture
V-ing form
I couldn't be picturing you couldn't be picturing he couldn't be picturing we couldn't be picturing you couldn't be picturing they couldn't be picturing
Perfect
I couldn't have pictured you couldn't have pictured he couldn't have pictured we couldn't have pictured you couldn't have pictured they couldn't have pictured
V-ing perfect
I couldn't have been picturing you couldn't have been picturing he couldn't have been picturing we couldn't have been picturing you couldn't have been picturing they couldn't 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
couldn't I picture? couldn't you picture? couldn't he picture? couldn't we picture? couldn't you picture? couldn't they picture?
V-ing form
couldn't I be picturing? couldn't you be picturing? couldn't he be picturing? couldn't we be picturing? couldn't you be picturing? couldn't they be picturing?
Perfect
couldn't I have pictured? couldn't you have pictured? couldn't he have pictured? couldn't we have pictured? couldn't you have pictured? couldn't they have pictured?
V-ing perfect
couldn't I have been picturing? couldn't you have been picturing? couldn't he have been picturing? couldn't we have been picturing? couldn't you have been picturing? couldn't they have been picturing?