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