English verb conjugation
COULD SKIRR

Regular verb: skirr - skirred - skirred

Affirmation

Simple form	V-ing form
I could skirr you could skirr he could skirr we could skirr you could skirr they could skirr	I could be skirring you could be skirring he could be skirring we could be skirring you could be skirring they could be skirring
Perfect	V-ing perfect
I could have skirred you could have skirred he could have skirred we could have skirred you could have skirred they could have skirred	I could have been skirring you could have been skirring he could have been skirring we could have been skirring you could have been skirring they could have been skirring

Negation

Simple form	V-ing form
I couldn't skirr you couldn't skirr he couldn't skirr we couldn't skirr you couldn't skirr they couldn't skirr	I couldn't be skirring you couldn't be skirring he couldn't be skirring we couldn't be skirring you couldn't be skirring they couldn't be skirring
Perfect	V-ing perfect
I couldn't have skirred you couldn't have skirred he couldn't have skirred we couldn't have skirred you couldn't have skirred they couldn't have skirred	I couldn't have been skirring you couldn't have been skirring he couldn't have been skirring we couldn't have been skirring you couldn't have been skirring they couldn't have been skirring

Interrogative form

Simple form	V-ing form
could I skirr? could you skirr? could he skirr? could we skirr? could you skirr? could they skirr?	could I be skirring? could you be skirring? could he be skirring? could we be skirring? could you be skirring? could they be skirring?
Perfect	V-ing perfect
could I have skirred? could you have skirred? could he have skirred? could we have skirred? could you have skirred? could they have skirred?	could I have been skirring? could you have been skirring? could he have been skirring? could we have been skirring? could you have been skirring? could they have been skirring?

Interro-negative form

Simple form	V-ing form
couldn't I skirr? couldn't you skirr? couldn't he skirr? couldn't we skirr? couldn't you skirr? couldn't they skirr?	couldn't I be skirring? couldn't you be skirring? couldn't he be skirring? couldn't we be skirring? couldn't you be skirring? couldn't they be skirring?
Perfect	V-ing perfect
couldn't I have skirred? couldn't you have skirred? couldn't he have skirred? couldn't we have skirred? couldn't you have skirred? couldn't they have skirred?	couldn't I have been skirring? couldn't you have been skirring? couldn't he have been skirring? couldn't we have been skirring? couldn't you have been skirring? couldn't they have been skirring?