must foster
Verbo regular: foster - fostered- fostered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must foster
you must foster
he must foster
we must foster
you must foster
they must foster 	I must be fostering
you must be fostering
he must be fostering
we must be fostering
you must be fostering
they must be fostering	I must have fostered
you must have fostered
he must have fostered
we must have fostered
you must have fostered
they must have fostered	I must have been fostering
you must have been fostering
he must have been fostering
we must have been fostering
you must have been fostering
they must have been fostering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't foster
you mustn't foster
he mustn't foster
we mustn't foster
you mustn't foster
they mustn't foster 	I mustn't be fostering
you mustn't be fostering
he mustn't be fostering
we mustn't be fostering
you mustn't be fostering
they mustn't be fostering	I mustn't have fostered
you mustn't have fostered
he mustn't have fostered
we mustn't have fostered
you mustn't have fostered
they mustn't have fostered	I mustn't have been fostering
you mustn't have been fostering
he mustn't have been fostering
we mustn't have been fostering
you mustn't have been fostering
they mustn't have been fostering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I foster?
must you foster?
must he foster?
must we foster?
must you foster?
must they foster? 	must I be fostering?
must you be fostering?
must he be fostering?
must we be fostering?
must you be fostering?
must they be fostering? 	must I have fostered?
must you have fostered?
must he have fostered?
must we have fostered?
must you have fostered?
must they have fostered? 	must I have been fostering?
must you have been fostering?
must he have been fostering?
must we have been fostering?
must you have been fostering?
must they have been fostering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I foster?
mustn't you foster?
mustn't he foster?
mustn't we foster?
mustn't you foster?
mustn't they foster? 	mustn't I be fostering?
mustn't you be fostering?
mustn't he be fostering?
mustn't we be fostering?
mustn't you be fostering?
mustn't they be fostering? 	mustn't I have fostered?
mustn't you have fostered?
mustn't he have fostered?
mustn't we have fostered?
mustn't you have fostered?
mustn't they have fostered? 	mustn't I have been fostering?
mustn't you have been fostering?
mustn't he have been fostering?
mustn't we have been fostering?
mustn't you have been fostering?
mustn't they have been fostering?