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 couldn't grain you couldn't grain he couldn't grain we couldn't grain you couldn't grain they couldn't grain	I couldn't be graining you couldn't be graining he couldn't be graining we couldn't be graining you couldn't be graining they couldn't be graining
Perfect	V-ing perfect
I couldn't have grained you couldn't have grained he couldn't have grained we couldn't have grained you couldn't have grained they couldn't have grained	I couldn't have been graining you couldn't have been graining he couldn't have been graining we couldn't have been graining you couldn't have been graining they couldn't 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
couldn't I grain? couldn't you grain? couldn't he grain? couldn't we grain? couldn't you grain? couldn't they grain?	couldn't I be graining? couldn't you be graining? couldn't he be graining? couldn't we be graining? couldn't you be graining? couldn't they be graining?
Perfect	V-ing perfect
couldn't I have grained? couldn't you have grained? couldn't he have grained? couldn't we have grained? couldn't you have grained? couldn't they have grained?	couldn't I have been graining? couldn't you have been graining? couldn't he have been graining? couldn't we have been graining? couldn't you have been graining? couldn't they have been graining?