could grain
Regular verb: grain - grained- grained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?