must deteriorate
Verbo regolare: deteriorate - deteriorated- deteriorated

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must deteriorate
you must deteriorate
he must deteriorate
we must deteriorate
you must deteriorate
they must deteriorate 	I must be deteriorating
you must be deteriorating
he must be deteriorating
we must be deteriorating
you must be deteriorating
they must be deteriorating	I must have deteriorated
you must have deteriorated
he must have deteriorated
we must have deteriorated
you must have deteriorated
they must have deteriorated	I must have been deteriorating
you must have been deteriorating
he must have been deteriorating
we must have been deteriorating
you must have been deteriorating
they must have been deteriorating	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I mustn't deteriorate
you mustn't deteriorate
he mustn't deteriorate
we mustn't deteriorate
you mustn't deteriorate
they mustn't deteriorate 	I mustn't be deteriorating
you mustn't be deteriorating
he mustn't be deteriorating
we mustn't be deteriorating
you mustn't be deteriorating
they mustn't be deteriorating	I mustn't have deteriorated
you mustn't have deteriorated
he mustn't have deteriorated
we mustn't have deteriorated
you mustn't have deteriorated
they mustn't have deteriorated	I mustn't have been deteriorating
you mustn't have been deteriorating
he mustn't have been deteriorating
we mustn't have been deteriorating
you mustn't have been deteriorating
they mustn't have been deteriorating	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I deteriorate?
must you deteriorate?
must he deteriorate?
must we deteriorate?
must you deteriorate?
must they deteriorate? 	must I be deteriorating?
must you be deteriorating?
must he be deteriorating?
must we be deteriorating?
must you be deteriorating?
must they be deteriorating? 	must I have deteriorated?
must you have deteriorated?
must he have deteriorated?
must we have deteriorated?
must you have deteriorated?
must they have deteriorated? 	must I have been deteriorating?
must you have been deteriorating?
must he have been deteriorating?
must we have been deteriorating?
must you have been deteriorating?
must they have been deteriorating? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
mustn't I deteriorate?
mustn't you deteriorate?
mustn't he deteriorate?
mustn't we deteriorate?
mustn't you deteriorate?
mustn't they deteriorate? 	mustn't I be deteriorating?
mustn't you be deteriorating?
mustn't he be deteriorating?
mustn't we be deteriorating?
mustn't you be deteriorating?
mustn't they be deteriorating? 	mustn't I have deteriorated?
mustn't you have deteriorated?
mustn't he have deteriorated?
mustn't we have deteriorated?
mustn't you have deteriorated?
mustn't they have deteriorated? 	mustn't I have been deteriorating?
mustn't you have been deteriorating?
mustn't he have been deteriorating?
mustn't we have been deteriorating?
mustn't you have been deteriorating?
mustn't they have been deteriorating?