English verb conjugation
MUST ENQUIRE

Regular verb: enquire - enquired - enquired

Affirmation

Simple form	V-ing form
I must enquire you must enquire he must enquire we must enquire you must enquire they must enquire	I must be enquiring you must be enquiring he must be enquiring we must be enquiring you must be enquiring they must be enquiring
Perfect	V-ing perfect
I must have enquired you must have enquired he must have enquired we must have enquired you must have enquired they must have enquired	I must have been enquiring you must have been enquiring he must have been enquiring we must have been enquiring you must have been enquiring they must have been enquiring

Negation

Simple form	V-ing form
I mustn't enquire you mustn't enquire he mustn't enquire we mustn't enquire you mustn't enquire they mustn't enquire	I mustn't be enquiring you mustn't be enquiring he mustn't be enquiring we mustn't be enquiring you mustn't be enquiring they mustn't be enquiring
Perfect	V-ing perfect
I mustn't have enquired you mustn't have enquired he mustn't have enquired we mustn't have enquired you mustn't have enquired they mustn't have enquired	I mustn't have been enquiring you mustn't have been enquiring he mustn't have been enquiring we mustn't have been enquiring you mustn't have been enquiring they mustn't have been enquiring

Interrogative form

Simple form	V-ing form
must I enquire? must you enquire? must he enquire? must we enquire? must you enquire? must they enquire?	must I be enquiring? must you be enquiring? must he be enquiring? must we be enquiring? must you be enquiring? must they be enquiring?
Perfect	V-ing perfect
must I have enquired? must you have enquired? must he have enquired? must we have enquired? must you have enquired? must they have enquired?	must I have been enquiring? must you have been enquiring? must he have been enquiring? must we have been enquiring? must you have been enquiring? must they have been enquiring?

Interro-negative form

Simple form	V-ing form
mustn't I enquire? mustn't you enquire? mustn't he enquire? mustn't we enquire? mustn't you enquire? mustn't they enquire?	mustn't I be enquiring? mustn't you be enquiring? mustn't he be enquiring? mustn't we be enquiring? mustn't you be enquiring? mustn't they be enquiring?
Perfect	V-ing perfect
mustn't I have enquired? mustn't you have enquired? mustn't he have enquired? mustn't we have enquired? mustn't you have enquired? mustn't they have enquired?	mustn't I have been enquiring? mustn't you have been enquiring? mustn't he have been enquiring? mustn't we have been enquiring? mustn't you have been enquiring? mustn't they have been enquiring?