English verb conjugation
MUST STUD

Regular verb: stud - studded - studded

Affirmation

Simple form	V-ing form
I must stud you must stud he must stud we must stud you must stud they must stud	I must be studding you must be studding he must be studding we must be studding you must be studding they must be studding
Perfect	V-ing perfect
I must have studded you must have studded he must have studded we must have studded you must have studded they must have studded	I must have been studding you must have been studding he must have been studding we must have been studding you must have been studding they must have been studding

Negation

Simple form	V-ing form
I mustn't stud you mustn't stud he mustn't stud we mustn't stud you mustn't stud they mustn't stud	I mustn't be studding you mustn't be studding he mustn't be studding we mustn't be studding you mustn't be studding they mustn't be studding
Perfect	V-ing perfect
I mustn't have studded you mustn't have studded he mustn't have studded we mustn't have studded you mustn't have studded they mustn't have studded	I mustn't have been studding you mustn't have been studding he mustn't have been studding we mustn't have been studding you mustn't have been studding they mustn't have been studding

Interrogative form

Simple form	V-ing form
must I stud? must you stud? must he stud? must we stud? must you stud? must they stud?	must I be studding? must you be studding? must he be studding? must we be studding? must you be studding? must they be studding?
Perfect	V-ing perfect
must I have studded? must you have studded? must he have studded? must we have studded? must you have studded? must they have studded?	must I have been studding? must you have been studding? must he have been studding? must we have been studding? must you have been studding? must they have been studding?

Interro-negative form

Simple form	V-ing form
mustn't I stud? mustn't you stud? mustn't he stud? mustn't we stud? mustn't you stud? mustn't they stud?	mustn't I be studding? mustn't you be studding? mustn't he be studding? mustn't we be studding? mustn't you be studding? mustn't they be studding?
Perfect	V-ing perfect
mustn't I have studded? mustn't you have studded? mustn't he have studded? mustn't we have studded? mustn't you have studded? mustn't they have studded?	mustn't I have been studding? mustn't you have been studding? mustn't he have been studding? mustn't we have been studding? mustn't you have been studding? mustn't they have been studding?