English verb conjugation
MUST SINGE

Regular verb: singe - singed - singed

Affirmation

Simple form	V-ing form
I must singe you must singe he must singe we must singe you must singe they must singe	I must be singing you must be singing he must be singing we must be singing you must be singing they must be singing
Perfect	V-ing perfect
I must have singed you must have singed he must have singed we must have singed you must have singed they must have singed	I must have been singing you must have been singing he must have been singing we must have been singing you must have been singing they must have been singing

Negation

Simple form	V-ing form
I mustn't singe you mustn't singe he mustn't singe we mustn't singe you mustn't singe they mustn't singe	I mustn't be singing you mustn't be singing he mustn't be singing we mustn't be singing you mustn't be singing they mustn't be singing
Perfect	V-ing perfect
I mustn't have singed you mustn't have singed he mustn't have singed we mustn't have singed you mustn't have singed they mustn't have singed	I mustn't have been singing you mustn't have been singing he mustn't have been singing we mustn't have been singing you mustn't have been singing they mustn't have been singing

Interrogative form

Simple form	V-ing form
must I singe? must you singe? must he singe? must we singe? must you singe? must they singe?	must I be singing? must you be singing? must he be singing? must we be singing? must you be singing? must they be singing?
Perfect	V-ing perfect
must I have singed? must you have singed? must he have singed? must we have singed? must you have singed? must they have singed?	must I have been singing? must you have been singing? must he have been singing? must we have been singing? must you have been singing? must they have been singing?

Interro-negative form

Simple form	V-ing form
mustn't I singe? mustn't you singe? mustn't he singe? mustn't we singe? mustn't you singe? mustn't they singe?	mustn't I be singing? mustn't you be singing? mustn't he be singing? mustn't we be singing? mustn't you be singing? mustn't they be singing?
Perfect	V-ing perfect
mustn't I have singed? mustn't you have singed? mustn't he have singed? mustn't we have singed? mustn't you have singed? mustn't they have singed?	mustn't I have been singing? mustn't you have been singing? mustn't he have been singing? mustn't we have been singing? mustn't you have been singing? mustn't they have been singing?