English verb conjugation
COULD SHIRR

Regular verb: shirr - shirred - shirred

Affirmation

Simple form	V-ing form
I could shirr you could shirr he could shirr we could shirr you could shirr they could shirr	I could be shirring you could be shirring he could be shirring we could be shirring you could be shirring they could be shirring
Perfect	V-ing perfect
I could have shirred you could have shirred he could have shirred we could have shirred you could have shirred they could have shirred	I could have been shirring you could have been shirring he could have been shirring we could have been shirring you could have been shirring they could have been shirring

Negation

Simple form	V-ing form
I could not shirr you could not shirr he could not shirr we could not shirr you could not shirr they could not shirr	I could not be shirring you could not be shirring he could not be shirring we could not be shirring you could not be shirring they could not be shirring
Perfect	V-ing perfect
I could not have shirred you could not have shirred he could not have shirred we could not have shirred you could not have shirred they could not have shirred	I could not have been shirring you could not have been shirring he could not have been shirring we could not have been shirring you could not have been shirring they could not have been shirring

Interrogative form

Simple form	V-ing form
could I shirr? could you shirr? could he shirr? could we shirr? could you shirr? could they shirr?	could I be shirring? could you be shirring? could he be shirring? could we be shirring? could you be shirring? could they be shirring?
Perfect	V-ing perfect
could I have shirred? could you have shirred? could he have shirred? could we have shirred? could you have shirred? could they have shirred?	could I have been shirring? could you have been shirring? could he have been shirring? could we have been shirring? could you have been shirring? could they have been shirring?

Interro-negative form

Simple form	V-ing form
could I not shirr? could you not shirr? could he not shirr? could we not shirr? could you not shirr? could they not shirr?	could I not be shirring? could you not be shirring? could he not be shirring? could we not be shirring? could you not be shirring? could they not be shirring?
Perfect	V-ing perfect
could I not have shirred? could you not have shirred? could he not have shirred? could we not have shirred? could you not have shirred? could they not have shirred?	could I not have been shirring? could you not have been shirring? could he not have been shirring? could we not have been shirring? could you not have been shirring? could they not have been shirring?