must labour
Verbo regular: labour - laboured- laboured

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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?