English verb conjugation
COULD STOOL

Regular verb: stool - stooled - stooled

Affirmation

Simple form	V-ing form
I could stool you could stool she could stool we could stool you could stool they could stool	I could be stooling you could be stooling she 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 she 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 she 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 couldn't stool you couldn't stool she couldn't stool we couldn't stool you couldn't stool they couldn't stool	I couldn't be stooling you couldn't be stooling she couldn't be stooling we couldn't be stooling you couldn't be stooling they couldn't be stooling
Perfect	V-ing perfect
I couldn't have stooled you couldn't have stooled she couldn't have stooled we couldn't have stooled you couldn't have stooled they couldn't have stooled	I couldn't have been stooling you couldn't have been stooling she couldn't have been stooling we couldn't have been stooling you couldn't have been stooling they couldn't have been stooling

Interrogative form

Simple form	V-ing form
could I stool? could you stool? could she stool? could we stool? could you stool? could they stool?	could I be stooling? could you be stooling? could she 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 she 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 she 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
couldn't I stool? couldn't you stool? couldn't she stool? couldn't we stool? couldn't you stool? couldn't they stool?	couldn't I be stooling? couldn't you be stooling? couldn't she be stooling? couldn't we be stooling? couldn't you be stooling? couldn't they be stooling?
Perfect	V-ing perfect
couldn't I have stooled? couldn't you have stooled? couldn't she have stooled? couldn't we have stooled? couldn't you have stooled? couldn't they have stooled?	couldn't I have been stooling? couldn't you have been stooling? couldn't she have been stooling? couldn't we have been stooling? couldn't you have been stooling? couldn't they have been stooling?