English verb conjugation
COULD ENQUIRE

Regular verb: enquire - enquired - enquired

Affirmation

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

Negation

Simple form	V-ing form
I could not enquire you could not enquire he could not enquire we could not enquire you could not enquire they could not enquire	I could not be enquiring you could not be enquiring he could not be enquiring we could not be enquiring you could not be enquiring they could not be enquiring
Perfect	V-ing perfect
I could not have enquired you could not have enquired he could not have enquired we could not have enquired you could not have enquired they could not have enquired	I could not have been enquiring you could not have been enquiring he could not have been enquiring we could not have been enquiring you could not have been enquiring they could not have been enquiring

Interrogative form

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

Interro-negative form

Simple form	V-ing form
could I not enquire? could you not enquire? could he not enquire? could we not enquire? could you not enquire? could they not enquire?	could I not be enquiring? could you not be enquiring? could he not be enquiring? could we not be enquiring? could you not be enquiring? could they not be enquiring?
Perfect	V-ing perfect
could I not have enquired? could you not have enquired? could he not have enquired? could we not have enquired? could you not have enquired? could they not have enquired?	could I not have been enquiring? could you not have been enquiring? could he not have been enquiring? could we not have been enquiring? could you not have been enquiring? could they not have been enquiring?