English verb conjugation
MUST DETERIORATE

Regular verb: deteriorate - deteriorated - deteriorated

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?