English verb conjugation
CAN ENQUIRE

Regular verb: enquire - enquired - enquired

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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