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 couldn't tree you couldn't tree he couldn't tree we couldn't tree you couldn't tree they couldn't tree	I couldn't be treeing you couldn't be treeing he couldn't be treeing we couldn't be treeing you couldn't be treeing they couldn't be treeing
Perfect	V-ing perfect
I couldn't have treed you couldn't have treed he couldn't have treed we couldn't have treed you couldn't have treed they couldn't have treed	I couldn't have been treeing you couldn't have been treeing he couldn't have been treeing we couldn't have been treeing you couldn't have been treeing they couldn't 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
couldn't I tree? couldn't you tree? couldn't he tree? couldn't we tree? couldn't you tree? couldn't they tree?	couldn't I be treeing? couldn't you be treeing? couldn't he be treeing? couldn't we be treeing? couldn't you be treeing? couldn't they be treeing?
Perfect	V-ing perfect
couldn't I have treed? couldn't you have treed? couldn't he have treed? couldn't we have treed? couldn't you have treed? couldn't they have treed?	couldn't I have been treeing? couldn't you have been treeing? couldn't he have been treeing? couldn't we have been treeing? couldn't you have been treeing? couldn't they have been treeing?