English verb conjugation
MUST SAIL

Regular verb: sail - sailed - sailed

Affirmation

Simple form	V-ing form
I must sail you must sail she must sail we must sail you must sail they must sail	I must be sailing you must be sailing she must be sailing we must be sailing you must be sailing they must be sailing
Perfect	V-ing perfect
I must have sailed you must have sailed she must have sailed we must have sailed you must have sailed they must have sailed	I must have been sailing you must have been sailing she must have been sailing we must have been sailing you must have been sailing they must have been sailing

Negation

Simple form	V-ing form
I must not sail you must not sail she must not sail we must not sail you must not sail they must not sail	I must not be sailing you must not be sailing she must not be sailing we must not be sailing you must not be sailing they must not be sailing
Perfect	V-ing perfect
I must not have sailed you must not have sailed she must not have sailed we must not have sailed you must not have sailed they must not have sailed	I must not have been sailing you must not have been sailing she must not have been sailing we must not have been sailing you must not have been sailing they must not have been sailing

Interrogative form

Simple form	V-ing form
must I sail? must you sail? must she sail? must we sail? must you sail? must they sail?	must I be sailing? must you be sailing? must she be sailing? must we be sailing? must you be sailing? must they be sailing?
Perfect	V-ing perfect
must I have sailed? must you have sailed? must she have sailed? must we have sailed? must you have sailed? must they have sailed?	must I have been sailing? must you have been sailing? must she have been sailing? must we have been sailing? must you have been sailing? must they have been sailing?

Interro-negative form

Simple form	V-ing form
must I not sail? must you not sail? must she not sail? must we not sail? must you not sail? must they not sail?	must I not be sailing? must you not be sailing? must she not be sailing? must we not be sailing? must you not be sailing? must they not be sailing?
Perfect	V-ing perfect
must I not have sailed? must you not have sailed? must she not have sailed? must we not have sailed? must you not have sailed? must they not have sailed?	must I not have been sailing? must you not have been sailing? must she not have been sailing? must we not have been sailing? must you not have been sailing? must they not have been sailing?