English verb conjugation
COULD GRAIN

Regular verb: grain - grained - grained

Affirmation

Simple form	V-ing form
I could grain you could grain he could grain we could grain you could grain they could grain	I could be graining you could be graining he could be graining we could be graining you could be graining they could be graining
Perfect	V-ing perfect
I could have grained you could have grained he could have grained we could have grained you could have grained they could have grained	I could have been graining you could have been graining he could have been graining we could have been graining you could have been graining they could have been graining

Negation

Simple form	V-ing form
I could not grain you could not grain he could not grain we could not grain you could not grain they could not grain	I could not be graining you could not be graining he could not be graining we could not be graining you could not be graining they could not be graining
Perfect	V-ing perfect
I could not have grained you could not have grained he could not have grained we could not have grained you could not have grained they could not have grained	I could not have been graining you could not have been graining he could not have been graining we could not have been graining you could not have been graining they could not have been graining

Interrogative form

Simple form	V-ing form
could I grain? could you grain? could he grain? could we grain? could you grain? could they grain?	could I be graining? could you be graining? could he be graining? could we be graining? could you be graining? could they be graining?
Perfect	V-ing perfect
could I have grained? could you have grained? could he have grained? could we have grained? could you have grained? could they have grained?	could I have been graining? could you have been graining? could he have been graining? could we have been graining? could you have been graining? could they have been graining?

Interro-negative form

Simple form	V-ing form
could I not grain? could you not grain? could he not grain? could we not grain? could you not grain? could they not grain?	could I not be graining? could you not be graining? could he not be graining? could we not be graining? could you not be graining? could they not be graining?
Perfect	V-ing perfect
could I not have grained? could you not have grained? could he not have grained? could we not have grained? could you not have grained? could they not have grained?	could I not have been graining? could you not have been graining? could he not have been graining? could we not have been graining? could you not have been graining? could they not have been graining?