I could adventure you could adventure he could adventure we could adventure you could adventure they could adventure
V-ing form
I could be adventuring you could be adventuring he could be adventuring we could be adventuring you could be adventuring they could be adventuring
Perfect
I could have adventured you could have adventured he could have adventured we could have adventured you could have adventured they could have adventured
V-ing perfect
I could have been adventuring you could have been adventuring he could have been adventuring we could have been adventuring you could have been adventuring they could have been adventuring
Negation
Simple form
I couldn't adventure you couldn't adventure he couldn't adventure we couldn't adventure you couldn't adventure they couldn't adventure
V-ing form
I couldn't be adventuring you couldn't be adventuring he couldn't be adventuring we couldn't be adventuring you couldn't be adventuring they couldn't be adventuring
Perfect
I couldn't have adventured you couldn't have adventured he couldn't have adventured we couldn't have adventured you couldn't have adventured they couldn't have adventured
V-ing perfect
I couldn't have been adventuring you couldn't have been adventuring he couldn't have been adventuring we couldn't have been adventuring you couldn't have been adventuring they couldn't have been adventuring
Interrogative form
Simple form
could I adventure? could you adventure? could he adventure? could we adventure? could you adventure? could they adventure?
V-ing form
could I be adventuring? could you be adventuring? could he be adventuring? could we be adventuring? could you be adventuring? could they be adventuring?
Perfect
could I have adventured? could you have adventured? could he have adventured? could we have adventured? could you have adventured? could they have adventured?
V-ing perfect
could I have been adventuring? could you have been adventuring? could he have been adventuring? could we have been adventuring? could you have been adventuring? could they have been adventuring?
Interro-negative form
Simple form
couldn't I adventure? couldn't you adventure? couldn't he adventure? couldn't we adventure? couldn't you adventure? couldn't they adventure?
V-ing form
couldn't I be adventuring? couldn't you be adventuring? couldn't he be adventuring? couldn't we be adventuring? couldn't you be adventuring? couldn't they be adventuring?
Perfect
couldn't I have adventured? couldn't you have adventured? couldn't he have adventured? couldn't we have adventured? couldn't you have adventured? couldn't they have adventured?
V-ing perfect
couldn't I have been adventuring? couldn't you have been adventuring? couldn't he have been adventuring? couldn't we have been adventuring? couldn't you have been adventuring? couldn't they have been adventuring?