English verb conjugation
COULD RETROFIRE

Regular verb: retrofire - retrofired - retrofired

Affirmation

Simple form	V-ing form
I could retrofire you could retrofire he could retrofire we could retrofire you could retrofire they could retrofire	I could be retrofiring you could be retrofiring he could be retrofiring we could be retrofiring you could be retrofiring they could be retrofiring
Perfect	V-ing perfect
I could have retrofired you could have retrofired he could have retrofired we could have retrofired you could have retrofired they could have retrofired	I could have been retrofiring you could have been retrofiring he could have been retrofiring we could have been retrofiring you could have been retrofiring they could have been retrofiring

Negation

Simple form	V-ing form
I could not retrofire you could not retrofire he could not retrofire we could not retrofire you could not retrofire they could not retrofire	I could not be retrofiring you could not be retrofiring he could not be retrofiring we could not be retrofiring you could not be retrofiring they could not be retrofiring
Perfect	V-ing perfect
I could not have retrofired you could not have retrofired he could not have retrofired we could not have retrofired you could not have retrofired they could not have retrofired	I could not have been retrofiring you could not have been retrofiring he could not have been retrofiring we could not have been retrofiring you could not have been retrofiring they could not have been retrofiring

Interrogative form

Simple form	V-ing form
could I retrofire? could you retrofire? could he retrofire? could we retrofire? could you retrofire? could they retrofire?	could I be retrofiring? could you be retrofiring? could he be retrofiring? could we be retrofiring? could you be retrofiring? could they be retrofiring?
Perfect	V-ing perfect
could I have retrofired? could you have retrofired? could he have retrofired? could we have retrofired? could you have retrofired? could they have retrofired?	could I have been retrofiring? could you have been retrofiring? could he have been retrofiring? could we have been retrofiring? could you have been retrofiring? could they have been retrofiring?

Interro-negative form

Simple form	V-ing form
could I not retrofire? could you not retrofire? could he not retrofire? could we not retrofire? could you not retrofire? could they not retrofire?	could I not be retrofiring? could you not be retrofiring? could he not be retrofiring? could we not be retrofiring? could you not be retrofiring? could they not be retrofiring?
Perfect	V-ing perfect
could I not have retrofired? could you not have retrofired? could he not have retrofired? could we not have retrofired? could you not have retrofired? could they not have retrofired?	could I not have been retrofiring? could you not have been retrofiring? could he not have been retrofiring? could we not have been retrofiring? could you not have been retrofiring? could they not have been retrofiring?