English verb conjugation
MUST SWIM

Irregular verb: swim - swam - swum

Affirmation

Simple form	V-ing form
I must swim you must swim he must swim we must swim you must swim they must swim	I must be swimming you must be swimming he must be swimming we must be swimming you must be swimming they must be swimming
Perfect	V-ing perfect
I must have swum you must have swum he must have swum we must have swum you must have swum they must have swum	I must have been swimming you must have been swimming he must have been swimming we must have been swimming you must have been swimming they must have been swimming

Negation

Simple form	V-ing form
I must not swim you must not swim he must not swim we must not swim you must not swim they must not swim	I must not be swimming you must not be swimming he must not be swimming we must not be swimming you must not be swimming they must not be swimming
Perfect	V-ing perfect
I must not have swum you must not have swum he must not have swum we must not have swum you must not have swum they must not have swum	I must not have been swimming you must not have been swimming he must not have been swimming we must not have been swimming you must not have been swimming they must not have been swimming

Interrogative form

Simple form	V-ing form
must I swim? must you swim? must he swim? must we swim? must you swim? must they swim?	must I be swimming? must you be swimming? must he be swimming? must we be swimming? must you be swimming? must they be swimming?
Perfect	V-ing perfect
must I have swum? must you have swum? must he have swum? must we have swum? must you have swum? must they have swum?	must I have been swimming? must you have been swimming? must he have been swimming? must we have been swimming? must you have been swimming? must they have been swimming?

Interro-negative form

Simple form	V-ing form
must I not swim? must you not swim? must he not swim? must we not swim? must you not swim? must they not swim?	must I not be swimming? must you not be swimming? must he not be swimming? must we not be swimming? must you not be swimming? must they not be swimming?
Perfect	V-ing perfect
must I not have swum? must you not have swum? must he not have swum? must we not have swum? must you not have swum? must they not have swum?	must I not have been swimming? must you not have been swimming? must he not have been swimming? must we not have been swimming? must you not have been swimming? must they not have been swimming?