English verb conjugation
COULD INQUIRE

Regular verb: inquire - inquired - inquired

Affirmation

Simple form	V-ing form
I could inquire you could inquire he could inquire we could inquire you could inquire they could inquire	I could be inquiring you could be inquiring he could be inquiring we could be inquiring you could be inquiring they could be inquiring
Perfect	V-ing perfect
I could have inquired you could have inquired he could have inquired we could have inquired you could have inquired they could have inquired	I could have been inquiring you could have been inquiring he could have been inquiring we could have been inquiring you could have been inquiring they could have been inquiring

Negation

Simple form	V-ing form
I could not inquire you could not inquire he could not inquire we could not inquire you could not inquire they could not inquire	I could not be inquiring you could not be inquiring he could not be inquiring we could not be inquiring you could not be inquiring they could not be inquiring
Perfect	V-ing perfect
I could not have inquired you could not have inquired he could not have inquired we could not have inquired you could not have inquired they could not have inquired	I could not have been inquiring you could not have been inquiring he could not have been inquiring we could not have been inquiring you could not have been inquiring they could not have been inquiring

Interrogative form

Simple form	V-ing form
could I inquire? could you inquire? could he inquire? could we inquire? could you inquire? could they inquire?	could I be inquiring? could you be inquiring? could he be inquiring? could we be inquiring? could you be inquiring? could they be inquiring?
Perfect	V-ing perfect
could I have inquired? could you have inquired? could he have inquired? could we have inquired? could you have inquired? could they have inquired?	could I have been inquiring? could you have been inquiring? could he have been inquiring? could we have been inquiring? could you have been inquiring? could they have been inquiring?

Interro-negative form

Simple form	V-ing form
could I not inquire? could you not inquire? could he not inquire? could we not inquire? could you not inquire? could they not inquire?	could I not be inquiring? could you not be inquiring? could he not be inquiring? could we not be inquiring? could you not be inquiring? could they not be inquiring?
Perfect	V-ing perfect
could I not have inquired? could you not have inquired? could he not have inquired? could we not have inquired? could you not have inquired? could they not have inquired?	could I not have been inquiring? could you not have been inquiring? could he not have been inquiring? could we not have been inquiring? could you not have been inquiring? could they not have been inquiring?