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 mustn't swim you mustn't swim he mustn't swim we mustn't swim you mustn't swim they mustn't swim	I mustn't be swimming you mustn't be swimming he mustn't be swimming we mustn't be swimming you mustn't be swimming they mustn't be swimming
Perfect	V-ing perfect
I mustn't have swum you mustn't have swum he mustn't have swum we mustn't have swum you mustn't have swum they mustn't have swum	I mustn't have been swimming you mustn't have been swimming he mustn't have been swimming we mustn't have been swimming you mustn't have been swimming they mustn't 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
mustn't I swim? mustn't you swim? mustn't he swim? mustn't we swim? mustn't you swim? mustn't they swim?	mustn't I be swimming? mustn't you be swimming? mustn't he be swimming? mustn't we be swimming? mustn't you be swimming? mustn't they be swimming?
Perfect	V-ing perfect
mustn't I have swum? mustn't you have swum? mustn't he have swum? mustn't we have swum? mustn't you have swum? mustn't they have swum?	mustn't I have been swimming? mustn't you have been swimming? mustn't he have been swimming? mustn't we have been swimming? mustn't you have been swimming? mustn't they have been swimming?