English verb conjugation
COULD STAIN

Regular verb: stain - stained - stained

Affirmation

Simple form	V-ing form
I could stain you could stain she could stain we could stain you could stain they could stain	I could be staining you could be staining she could be staining we could be staining you could be staining they could be staining
Perfect	V-ing perfect
I could have stained you could have stained she could have stained we could have stained you could have stained they could have stained	I could have been staining you could have been staining she could have been staining we could have been staining you could have been staining they could have been staining

Negation

Simple form	V-ing form
I could not stain you could not stain she could not stain we could not stain you could not stain they could not stain	I could not be staining you could not be staining she could not be staining we could not be staining you could not be staining they could not be staining
Perfect	V-ing perfect
I could not have stained you could not have stained she could not have stained we could not have stained you could not have stained they could not have stained	I could not have been staining you could not have been staining she could not have been staining we could not have been staining you could not have been staining they could not have been staining

Interrogative form

Simple form	V-ing form
could I stain? could you stain? could she stain? could we stain? could you stain? could they stain?	could I be staining? could you be staining? could she be staining? could we be staining? could you be staining? could they be staining?
Perfect	V-ing perfect
could I have stained? could you have stained? could she have stained? could we have stained? could you have stained? could they have stained?	could I have been staining? could you have been staining? could she have been staining? could we have been staining? could you have been staining? could they have been staining?

Interro-negative form

Simple form	V-ing form
could I not stain? could you not stain? could she not stain? could we not stain? could you not stain? could they not stain?	could I not be staining? could you not be staining? could she not be staining? could we not be staining? could you not be staining? could they not be staining?
Perfect	V-ing perfect
could I not have stained? could you not have stained? could she not have stained? could we not have stained? could you not have stained? could they not have stained?	could I not have been staining? could you not have been staining? could she not have been staining? could we not have been staining? could you not have been staining? could they not have been staining?