English verb conjugation
COULD TREE

Regular verb: tree - treed - treed

Affirmation

Simple form	V-ing form
I could tree you could tree he could tree we could tree you could tree they could tree	I could be treeing you could be treeing he could be treeing we could be treeing you could be treeing they could be treeing
Perfect	V-ing perfect
I could have treed you could have treed he could have treed we could have treed you could have treed they could have treed	I could have been treeing you could have been treeing he could have been treeing we could have been treeing you could have been treeing they could have been treeing

Negation

Simple form	V-ing form
I could not tree you could not tree he could not tree we could not tree you could not tree they could not tree	I could not be treeing you could not be treeing he could not be treeing we could not be treeing you could not be treeing they could not be treeing
Perfect	V-ing perfect
I could not have treed you could not have treed he could not have treed we could not have treed you could not have treed they could not have treed	I could not have been treeing you could not have been treeing he could not have been treeing we could not have been treeing you could not have been treeing they could not have been treeing

Interrogative form

Simple form	V-ing form
could I tree? could you tree? could he tree? could we tree? could you tree? could they tree?	could I be treeing? could you be treeing? could he be treeing? could we be treeing? could you be treeing? could they be treeing?
Perfect	V-ing perfect
could I have treed? could you have treed? could he have treed? could we have treed? could you have treed? could they have treed?	could I have been treeing? could you have been treeing? could he have been treeing? could we have been treeing? could you have been treeing? could they have been treeing?

Interro-negative form

Simple form	V-ing form
could I not tree? could you not tree? could he not tree? could we not tree? could you not tree? could they not tree?	could I not be treeing? could you not be treeing? could he not be treeing? could we not be treeing? could you not be treeing? could they not be treeing?
Perfect	V-ing perfect
could I not have treed? could you not have treed? could he not have treed? could we not have treed? could you not have treed? could they not have treed?	could I not have been treeing? could you not have been treeing? could he not have been treeing? could we not have been treeing? could you not have been treeing? could they not have been treeing?