English verb conjugation
MUST LABOUR

Regular verb: labour - laboured - laboured

Affirmation

Simple form	V-ing form
I must labour you must labour he must labour we must labour you must labour they must labour	I must be labouring you must be labouring he must be labouring we must be labouring you must be labouring they must be labouring
Perfect	V-ing perfect
I must have laboured you must have laboured he must have laboured we must have laboured you must have laboured they must have laboured	I must have been labouring you must have been labouring he must have been labouring we must have been labouring you must have been labouring they must have been labouring

Negation

Simple form	V-ing form
I mustn't labour you mustn't labour he mustn't labour we mustn't labour you mustn't labour they mustn't labour	I mustn't be labouring you mustn't be labouring he mustn't be labouring we mustn't be labouring you mustn't be labouring they mustn't be labouring
Perfect	V-ing perfect
I mustn't have laboured you mustn't have laboured he mustn't have laboured we mustn't have laboured you mustn't have laboured they mustn't have laboured	I mustn't have been labouring you mustn't have been labouring he mustn't have been labouring we mustn't have been labouring you mustn't have been labouring they mustn't have been labouring

Interrogative form

Simple form	V-ing form
must I labour? must you labour? must he labour? must we labour? must you labour? must they labour?	must I be labouring? must you be labouring? must he be labouring? must we be labouring? must you be labouring? must they be labouring?
Perfect	V-ing perfect
must I have laboured? must you have laboured? must he have laboured? must we have laboured? must you have laboured? must they have laboured?	must I have been labouring? must you have been labouring? must he have been labouring? must we have been labouring? must you have been labouring? must they have been labouring?

Interro-negative form

Simple form	V-ing form
mustn't I labour? mustn't you labour? mustn't he labour? mustn't we labour? mustn't you labour? mustn't they labour?	mustn't I be labouring? mustn't you be labouring? mustn't he be labouring? mustn't we be labouring? mustn't you be labouring? mustn't they be labouring?
Perfect	V-ing perfect
mustn't I have laboured? mustn't you have laboured? mustn't he have laboured? mustn't we have laboured? mustn't you have laboured? mustn't they have laboured?	mustn't I have been labouring? mustn't you have been labouring? mustn't he have been labouring? mustn't we have been labouring? mustn't you have been labouring? mustn't they have been labouring?