English verb conjugation
MUST SEINE

Regular verb: seine - seined - seined

Affirmation

Simple form	V-ing form
I must seine you must seine he must seine we must seine you must seine they must seine	I must be seining you must be seining he must be seining we must be seining you must be seining they must be seining
Perfect	V-ing perfect
I must have seined you must have seined he must have seined we must have seined you must have seined they must have seined	I must have been seining you must have been seining he must have been seining we must have been seining you must have been seining they must have been seining

Negation

Simple form	V-ing form
I mustn't seine you mustn't seine he mustn't seine we mustn't seine you mustn't seine they mustn't seine	I mustn't be seining you mustn't be seining he mustn't be seining we mustn't be seining you mustn't be seining they mustn't be seining
Perfect	V-ing perfect
I mustn't have seined you mustn't have seined he mustn't have seined we mustn't have seined you mustn't have seined they mustn't have seined	I mustn't have been seining you mustn't have been seining he mustn't have been seining we mustn't have been seining you mustn't have been seining they mustn't have been seining

Interrogative form

Simple form	V-ing form
must I seine? must you seine? must he seine? must we seine? must you seine? must they seine?	must I be seining? must you be seining? must he be seining? must we be seining? must you be seining? must they be seining?
Perfect	V-ing perfect
must I have seined? must you have seined? must he have seined? must we have seined? must you have seined? must they have seined?	must I have been seining? must you have been seining? must he have been seining? must we have been seining? must you have been seining? must they have been seining?

Interro-negative form

Simple form	V-ing form
mustn't I seine? mustn't you seine? mustn't he seine? mustn't we seine? mustn't you seine? mustn't they seine?	mustn't I be seining? mustn't you be seining? mustn't he be seining? mustn't we be seining? mustn't you be seining? mustn't they be seining?
Perfect	V-ing perfect
mustn't I have seined? mustn't you have seined? mustn't he have seined? mustn't we have seined? mustn't you have seined? mustn't they have seined?	mustn't I have been seining? mustn't you have been seining? mustn't he have been seining? mustn't we have been seining? mustn't you have been seining? mustn't they have been seining?