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
she must deteriorate
we must deteriorate
you must deteriorate
they must deteriorate 	I must be deteriorating
you must be deteriorating
she must be deteriorating
we must be deteriorating
you must be deteriorating
they must be deteriorating	I must have deteriorated
you must have deteriorated
she 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
she 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 must not deteriorate
you must not deteriorate
she must not deteriorate
we must not deteriorate
you must not deteriorate
they must not deteriorate 	I must not be deteriorating
you must not be deteriorating
she must not be deteriorating
we must not be deteriorating
you must not be deteriorating
they must not be deteriorating	I must not have deteriorated
you must not have deteriorated
she must not have deteriorated
we must not have deteriorated
you must not have deteriorated
they must not have deteriorated	I must not have been deteriorating
you must not have been deteriorating
she must not have been deteriorating
we must not have been deteriorating
you must not have been deteriorating
they must not have been deteriorating	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I deteriorate?
must you deteriorate?
must she deteriorate?
must we deteriorate?
must you deteriorate?
must they deteriorate? 	must I be deteriorating?
must you be deteriorating?
must she be deteriorating?
must we be deteriorating?
must you be deteriorating?
must they be deteriorating? 	must I have deteriorated?
must you have deteriorated?
must she 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 she 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 	
must I not deteriorate?
must you not deteriorate?
must she not deteriorate?
must we not deteriorate?
must you not deteriorate?
must they not deteriorate? 	must I not be deteriorating?
must you not be deteriorating?
must she not be deteriorating?
must we not be deteriorating?
must you not be deteriorating?
must they not be deteriorating? 	must I not have deteriorated?
must you not have deteriorated?
must she not have deteriorated?
must we not have deteriorated?
must you not have deteriorated?
must they not have deteriorated? 	must I not have been deteriorating?
must you not have been deteriorating?
must she not have been deteriorating?
must we not have been deteriorating?
must you not have been deteriorating?
must they not have been deteriorating?