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 could not adventure you could not adventure he could not adventure we could not adventure you could not adventure they could not adventure
V-ing form
I could not be adventuring you could not be adventuring he could not be adventuring we could not be adventuring you could not be adventuring they could not be adventuring
Perfect
I could not have adventured you could not have adventured he could not have adventured we could not have adventured you could not have adventured they could not have adventured
V-ing perfect
I could not have been adventuring you could not have been adventuring he could not have been adventuring we could not have been adventuring you could not have been adventuring they could not 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
could I not adventure? could you not adventure? could he not adventure? could we not adventure? could you not adventure? could they not adventure?
V-ing form
could I not be adventuring? could you not be adventuring? could he not be adventuring? could we not be adventuring? could you not be adventuring? could they not be adventuring?
Perfect
could I not have adventured? could you not have adventured? could he not have adventured? could we not have adventured? could you not have adventured? could they not have adventured?
V-ing perfect
could I not have been adventuring? could you not have been adventuring? could he not have been adventuring? could we not have been adventuring? could you not have been adventuring? could they not have been adventuring?