English verb conjugation
COULD STOOL

Regular verb: stool - stooled - stooled

Affirmation

Simple form	V-ing form
I could stool you could stool he could stool we could stool you could stool they could stool	I could be stooling you could be stooling he could be stooling we could be stooling you could be stooling they could be stooling
Perfect	V-ing perfect
I could have stooled you could have stooled he could have stooled we could have stooled you could have stooled they could have stooled	I could have been stooling you could have been stooling he could have been stooling we could have been stooling you could have been stooling they could have been stooling

Negation

Simple form	V-ing form
I could not stool you could not stool he could not stool we could not stool you could not stool they could not stool	I could not be stooling you could not be stooling he could not be stooling we could not be stooling you could not be stooling they could not be stooling
Perfect	V-ing perfect
I could not have stooled you could not have stooled he could not have stooled we could not have stooled you could not have stooled they could not have stooled	I could not have been stooling you could not have been stooling he could not have been stooling we could not have been stooling you could not have been stooling they could not have been stooling

Interrogative form

Simple form	V-ing form
could I stool? could you stool? could he stool? could we stool? could you stool? could they stool?	could I be stooling? could you be stooling? could he be stooling? could we be stooling? could you be stooling? could they be stooling?
Perfect	V-ing perfect
could I have stooled? could you have stooled? could he have stooled? could we have stooled? could you have stooled? could they have stooled?	could I have been stooling? could you have been stooling? could he have been stooling? could we have been stooling? could you have been stooling? could they have been stooling?

Interro-negative form

Simple form	V-ing form
could I not stool? could you not stool? could he not stool? could we not stool? could you not stool? could they not stool?	could I not be stooling? could you not be stooling? could he not be stooling? could we not be stooling? could you not be stooling? could they not be stooling?
Perfect	V-ing perfect
could I not have stooled? could you not have stooled? could he not have stooled? could we not have stooled? could you not have stooled? could they not have stooled?	could I not have been stooling? could you not have been stooling? could he not have been stooling? could we not have been stooling? could you not have been stooling? could they not have been stooling?