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