English verb conjugation
MUST GRAIN

Regular verb: grain - grained - grained

Affirmation

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

Negation

Simple form	V-ing form
I mustn't grain you mustn't grain she mustn't grain we mustn't grain you mustn't grain they mustn't grain	I mustn't be graining you mustn't be graining she mustn't be graining we mustn't be graining you mustn't be graining they mustn't be graining
Perfect	V-ing perfect
I mustn't have grained you mustn't have grained she mustn't have grained we mustn't have grained you mustn't have grained they mustn't have grained	I mustn't have been graining you mustn't have been graining she mustn't have been graining we mustn't have been graining you mustn't have been graining they mustn't have been graining

Interrogative form

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

Interro-negative form

Simple form	V-ing form
mustn't I grain? mustn't you grain? mustn't she grain? mustn't we grain? mustn't you grain? mustn't they grain?	mustn't I be graining? mustn't you be graining? mustn't she be graining? mustn't we be graining? mustn't you be graining? mustn't they be graining?
Perfect	V-ing perfect
mustn't I have grained? mustn't you have grained? mustn't she have grained? mustn't we have grained? mustn't you have grained? mustn't they have grained?	mustn't I have been graining? mustn't you have been graining? mustn't she have been graining? mustn't we have been graining? mustn't you have been graining? mustn't they have been graining?