must preboil
Verbo regular: preboil - preboiled- preboiled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must preboil
you must preboil
he must preboil
we must preboil
you must preboil
they must preboil 	I must be preboiling
you must be preboiling
he must be preboiling
we must be preboiling
you must be preboiling
they must be preboiling	I must have preboiled
you must have preboiled
he must have preboiled
we must have preboiled
you must have preboiled
they must have preboiled	I must have been preboiling
you must have been preboiling
he must have been preboiling
we must have been preboiling
you must have been preboiling
they must have been preboiling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't preboil
you mustn't preboil
he mustn't preboil
we mustn't preboil
you mustn't preboil
they mustn't preboil 	I mustn't be preboiling
you mustn't be preboiling
he mustn't be preboiling
we mustn't be preboiling
you mustn't be preboiling
they mustn't be preboiling	I mustn't have preboiled
you mustn't have preboiled
he mustn't have preboiled
we mustn't have preboiled
you mustn't have preboiled
they mustn't have preboiled	I mustn't have been preboiling
you mustn't have been preboiling
he mustn't have been preboiling
we mustn't have been preboiling
you mustn't have been preboiling
they mustn't have been preboiling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I preboil?
must you preboil?
must he preboil?
must we preboil?
must you preboil?
must they preboil? 	must I be preboiling?
must you be preboiling?
must he be preboiling?
must we be preboiling?
must you be preboiling?
must they be preboiling? 	must I have preboiled?
must you have preboiled?
must he have preboiled?
must we have preboiled?
must you have preboiled?
must they have preboiled? 	must I have been preboiling?
must you have been preboiling?
must he have been preboiling?
must we have been preboiling?
must you have been preboiling?
must they have been preboiling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I preboil?
mustn't you preboil?
mustn't he preboil?
mustn't we preboil?
mustn't you preboil?
mustn't they preboil? 	mustn't I be preboiling?
mustn't you be preboiling?
mustn't he be preboiling?
mustn't we be preboiling?
mustn't you be preboiling?
mustn't they be preboiling? 	mustn't I have preboiled?
mustn't you have preboiled?
mustn't he have preboiled?
mustn't we have preboiled?
mustn't you have preboiled?
mustn't they have preboiled? 	mustn't I have been preboiling?
mustn't you have been preboiling?
mustn't he have been preboiling?
mustn't we have been preboiling?
mustn't you have been preboiling?
mustn't they have been preboiling?