must deteriorate
Verbo regular: deteriorate - deteriorated- deteriorated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto 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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not deteriorate
you must not deteriorate
he 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
he 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
he 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
he 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 simple 	Forma con V-ing 	Perfecto 	Perfecto 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 simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not deteriorate?
must you not deteriorate?
must he 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 he 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 he 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 he not have been deteriorating?
must we not have been deteriorating?
must you not have been deteriorating?
must they not have been deteriorating?