English verb conjugation
COULD STIR

Regular verb: stir - stirred - stirred

Affirmation

Simple form	V-ing form
I could stir you could stir he could stir we could stir you could stir they could stir	I could be stirring you could be stirring he could be stirring we could be stirring you could be stirring they could be stirring
Perfect	V-ing perfect
I could have stirred you could have stirred he could have stirred we could have stirred you could have stirred they could have stirred	I could have been stirring you could have been stirring he could have been stirring we could have been stirring you could have been stirring they could have been stirring

Negation

Simple form	V-ing form
I could not stir you could not stir he could not stir we could not stir you could not stir they could not stir	I could not be stirring you could not be stirring he could not be stirring we could not be stirring you could not be stirring they could not be stirring
Perfect	V-ing perfect
I could not have stirred you could not have stirred he could not have stirred we could not have stirred you could not have stirred they could not have stirred	I could not have been stirring you could not have been stirring he could not have been stirring we could not have been stirring you could not have been stirring they could not have been stirring

Interrogative form

Simple form	V-ing form
could I stir? could you stir? could he stir? could we stir? could you stir? could they stir?	could I be stirring? could you be stirring? could he be stirring? could we be stirring? could you be stirring? could they be stirring?
Perfect	V-ing perfect
could I have stirred? could you have stirred? could he have stirred? could we have stirred? could you have stirred? could they have stirred?	could I have been stirring? could you have been stirring? could he have been stirring? could we have been stirring? could you have been stirring? could they have been stirring?

Interro-negative form

Simple form	V-ing form
could I not stir? could you not stir? could he not stir? could we not stir? could you not stir? could they not stir?	could I not be stirring? could you not be stirring? could he not be stirring? could we not be stirring? could you not be stirring? could they not be stirring?
Perfect	V-ing perfect
could I not have stirred? could you not have stirred? could he not have stirred? could we not have stirred? could you not have stirred? could they not have stirred?	could I not have been stirring? could you not have been stirring? could he not have been stirring? could we not have been stirring? could you not have been stirring? could they not have been stirring?