English verb conjugation
CAN RETROFIRE

Regular verb: retrofire - retrofired - retrofired

Affirmation

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

Negation

Simple form	V-ing form
I can't retrofire you can't retrofire he can't retrofire we can't retrofire you can't retrofire they can't retrofire	I can't be retrofiring you can't be retrofiring he can't be retrofiring we can't be retrofiring you can't be retrofiring they can't be retrofiring
Perfect	V-ing perfect
I can't have retrofired you can't have retrofired he can't have retrofired we can't have retrofired you can't have retrofired they can't have retrofired	I can't have been retrofiring you can't have been retrofiring he can't have been retrofiring we can't have been retrofiring you can't have been retrofiring they can't have been retrofiring

Interrogative form

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

Interro-negative form

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