English verb conjugation
COULD SWISH

Regular verb: swish - swished - swished

Affirmation

Simple form	V-ing form
I could swish you could swish he could swish we could swish you could swish they could swish	I could be swishing you could be swishing he could be swishing we could be swishing you could be swishing they could be swishing
Perfect	V-ing perfect
I could have swished you could have swished he could have swished we could have swished you could have swished they could have swished	I could have been swishing you could have been swishing he could have been swishing we could have been swishing you could have been swishing they could have been swishing

Negation

Simple form	V-ing form
I couldn't swish you couldn't swish he couldn't swish we couldn't swish you couldn't swish they couldn't swish	I couldn't be swishing you couldn't be swishing he couldn't be swishing we couldn't be swishing you couldn't be swishing they couldn't be swishing
Perfect	V-ing perfect
I couldn't have swished you couldn't have swished he couldn't have swished we couldn't have swished you couldn't have swished they couldn't have swished	I couldn't have been swishing you couldn't have been swishing he couldn't have been swishing we couldn't have been swishing you couldn't have been swishing they couldn't have been swishing

Interrogative form

Simple form	V-ing form
could I swish? could you swish? could he swish? could we swish? could you swish? could they swish?	could I be swishing? could you be swishing? could he be swishing? could we be swishing? could you be swishing? could they be swishing?
Perfect	V-ing perfect
could I have swished? could you have swished? could he have swished? could we have swished? could you have swished? could they have swished?	could I have been swishing? could you have been swishing? could he have been swishing? could we have been swishing? could you have been swishing? could they have been swishing?

Interro-negative form

Simple form	V-ing form
couldn't I swish? couldn't you swish? couldn't he swish? couldn't we swish? couldn't you swish? couldn't they swish?	couldn't I be swishing? couldn't you be swishing? couldn't he be swishing? couldn't we be swishing? couldn't you be swishing? couldn't they be swishing?
Perfect	V-ing perfect
couldn't I have swished? couldn't you have swished? couldn't he have swished? couldn't we have swished? couldn't you have swished? couldn't they have swished?	couldn't I have been swishing? couldn't you have been swishing? couldn't he have been swishing? couldn't we have been swishing? couldn't you have been swishing? couldn't they have been swishing?