English verb conjugation
COULD CHOIR

Regular verb: choir - choired - choired

Affirmation

Simple form	V-ing form
I could choir you could choir he could choir we could choir you could choir they could choir	I could be choiring you could be choiring he could be choiring we could be choiring you could be choiring they could be choiring
Perfect	V-ing perfect
I could have choired you could have choired he could have choired we could have choired you could have choired they could have choired	I could have been choiring you could have been choiring he could have been choiring we could have been choiring you could have been choiring they could have been choiring

Negation

Simple form	V-ing form
I could not choir you could not choir he could not choir we could not choir you could not choir they could not choir	I could not be choiring you could not be choiring he could not be choiring we could not be choiring you could not be choiring they could not be choiring
Perfect	V-ing perfect
I could not have choired you could not have choired he could not have choired we could not have choired you could not have choired they could not have choired	I could not have been choiring you could not have been choiring he could not have been choiring we could not have been choiring you could not have been choiring they could not have been choiring

Interrogative form

Simple form	V-ing form
could I choir? could you choir? could he choir? could we choir? could you choir? could they choir?	could I be choiring? could you be choiring? could he be choiring? could we be choiring? could you be choiring? could they be choiring?
Perfect	V-ing perfect
could I have choired? could you have choired? could he have choired? could we have choired? could you have choired? could they have choired?	could I have been choiring? could you have been choiring? could he have been choiring? could we have been choiring? could you have been choiring? could they have been choiring?

Interro-negative form

Simple form	V-ing form
could I not choir? could you not choir? could he not choir? could we not choir? could you not choir? could they not choir?	could I not be choiring? could you not be choiring? could he not be choiring? could we not be choiring? could you not be choiring? could they not be choiring?
Perfect	V-ing perfect
could I not have choired? could you not have choired? could he not have choired? could we not have choired? could you not have choired? could they not have choired?	could I not have been choiring? could you not have been choiring? could he not have been choiring? could we not have been choiring? could you not have been choiring? could they not have been choiring?