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