English verb conjugation
MUST RETROFIRE

Regular verb: retrofire - retrofired - retrofired

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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