I could venture you could venture she could venture we could venture you could venture they could venture
V-ing form
I could be venturing you could be venturing she could be venturing we could be venturing you could be venturing they could be venturing
Perfect
I could have ventured you could have ventured she could have ventured we could have ventured you could have ventured they could have ventured
V-ing perfect
I could have been venturing you could have been venturing she could have been venturing we could have been venturing you could have been venturing they could have been venturing
Negation
Simple form
I couldn't venture you couldn't venture she couldn't venture we couldn't venture you couldn't venture they couldn't venture
V-ing form
I couldn't be venturing you couldn't be venturing she couldn't be venturing we couldn't be venturing you couldn't be venturing they couldn't be venturing
Perfect
I couldn't have ventured you couldn't have ventured she couldn't have ventured we couldn't have ventured you couldn't have ventured they couldn't have ventured
V-ing perfect
I couldn't have been venturing you couldn't have been venturing she couldn't have been venturing we couldn't have been venturing you couldn't have been venturing they couldn't have been venturing
Interrogative form
Simple form
could I venture? could you venture? could she venture? could we venture? could you venture? could they venture?
V-ing form
could I be venturing? could you be venturing? could she be venturing? could we be venturing? could you be venturing? could they be venturing?
Perfect
could I have ventured? could you have ventured? could she have ventured? could we have ventured? could you have ventured? could they have ventured?
V-ing perfect
could I have been venturing? could you have been venturing? could she have been venturing? could we have been venturing? could you have been venturing? could they have been venturing?
Interro-negative form
Simple form
couldn't I venture? couldn't you venture? couldn't she venture? couldn't we venture? couldn't you venture? couldn't they venture?
V-ing form
couldn't I be venturing? couldn't you be venturing? couldn't she be venturing? couldn't we be venturing? couldn't you be venturing? couldn't they be venturing?
Perfect
couldn't I have ventured? couldn't you have ventured? couldn't she have ventured? couldn't we have ventured? couldn't you have ventured? couldn't they have ventured?
V-ing perfect
couldn't I have been venturing? couldn't you have been venturing? couldn't she have been venturing? couldn't we have been venturing? couldn't you have been venturing? couldn't they have been venturing?