English verb conjugation
COULD DESTAIN

Regular verb: destain - destained - destained

Affirmation

Simple form	V-ing form
I could destain you could destain he could destain we could destain you could destain they could destain	I could be destaining you could be destaining he could be destaining we could be destaining you could be destaining they could be destaining
Perfect	V-ing perfect
I could have destained you could have destained he could have destained we could have destained you could have destained they could have destained	I could have been destaining you could have been destaining he could have been destaining we could have been destaining you could have been destaining they could have been destaining

Negation

Simple form	V-ing form
I couldn't destain you couldn't destain he couldn't destain we couldn't destain you couldn't destain they couldn't destain	I couldn't be destaining you couldn't be destaining he couldn't be destaining we couldn't be destaining you couldn't be destaining they couldn't be destaining
Perfect	V-ing perfect
I couldn't have destained you couldn't have destained he couldn't have destained we couldn't have destained you couldn't have destained they couldn't have destained	I couldn't have been destaining you couldn't have been destaining he couldn't have been destaining we couldn't have been destaining you couldn't have been destaining they couldn't have been destaining

Interrogative form

Simple form	V-ing form
could I destain? could you destain? could he destain? could we destain? could you destain? could they destain?	could I be destaining? could you be destaining? could he be destaining? could we be destaining? could you be destaining? could they be destaining?
Perfect	V-ing perfect
could I have destained? could you have destained? could he have destained? could we have destained? could you have destained? could they have destained?	could I have been destaining? could you have been destaining? could he have been destaining? could we have been destaining? could you have been destaining? could they have been destaining?

Interro-negative form

Simple form	V-ing form
couldn't I destain? couldn't you destain? couldn't he destain? couldn't we destain? couldn't you destain? couldn't they destain?	couldn't I be destaining? couldn't you be destaining? couldn't he be destaining? couldn't we be destaining? couldn't you be destaining? couldn't they be destaining?
Perfect	V-ing perfect
couldn't I have destained? couldn't you have destained? couldn't he have destained? couldn't we have destained? couldn't you have destained? couldn't they have destained?	couldn't I have been destaining? couldn't you have been destaining? couldn't he have been destaining? couldn't we have been destaining? couldn't you have been destaining? couldn't they have been destaining?