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 couldn't retrofire you couldn't retrofire he couldn't retrofire we couldn't retrofire you couldn't retrofire they couldn't retrofire	I couldn't be retrofiring you couldn't be retrofiring he couldn't be retrofiring we couldn't be retrofiring you couldn't be retrofiring they couldn't be retrofiring
Perfect	V-ing perfect
I couldn't have retrofired you couldn't have retrofired he couldn't have retrofired we couldn't have retrofired you couldn't have retrofired they couldn't have retrofired	I couldn't have been retrofiring you couldn't have been retrofiring he couldn't have been retrofiring we couldn't have been retrofiring you couldn't have been retrofiring they couldn't 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
couldn't I retrofire? couldn't you retrofire? couldn't he retrofire? couldn't we retrofire? couldn't you retrofire? couldn't they retrofire?	couldn't I be retrofiring? couldn't you be retrofiring? couldn't he be retrofiring? couldn't we be retrofiring? couldn't you be retrofiring? couldn't they be retrofiring?
Perfect	V-ing perfect
couldn't I have retrofired? couldn't you have retrofired? couldn't he have retrofired? couldn't we have retrofired? couldn't you have retrofired? couldn't they have retrofired?	couldn't I have been retrofiring? couldn't you have been retrofiring? couldn't he have been retrofiring? couldn't we have been retrofiring? couldn't you have been retrofiring? couldn't they have been retrofiring?