English verb conjugation
MUST DOUBLE-TONGUE

Regular verb: double-tongue - double-tongued - double-tongued

Affirmation

Simple form	V-ing form
I must double-tongue you must double-tongue she must double-tongue we must double-tongue you must double-tongue they must double-tongue	I must be double-tonguing you must be double-tonguing she must be double-tonguing we must be double-tonguing you must be double-tonguing they must be double-tonguing
Perfect	V-ing perfect
I must have double-tongued you must have double-tongued she must have double-tongued we must have double-tongued you must have double-tongued they must have double-tongued	I must have been double-tonguing you must have been double-tonguing she must have been double-tonguing we must have been double-tonguing you must have been double-tonguing they must have been double-tonguing

Negation

Simple form	V-ing form
I mustn't double-tongue you mustn't double-tongue she mustn't double-tongue we mustn't double-tongue you mustn't double-tongue they mustn't double-tongue	I mustn't be double-tonguing you mustn't be double-tonguing she mustn't be double-tonguing we mustn't be double-tonguing you mustn't be double-tonguing they mustn't be double-tonguing
Perfect	V-ing perfect
I mustn't have double-tongued you mustn't have double-tongued she mustn't have double-tongued we mustn't have double-tongued you mustn't have double-tongued they mustn't have double-tongued	I mustn't have been double-tonguing you mustn't have been double-tonguing she mustn't have been double-tonguing we mustn't have been double-tonguing you mustn't have been double-tonguing they mustn't have been double-tonguing

Interrogative form

Simple form	V-ing form
must I double-tongue? must you double-tongue? must she double-tongue? must we double-tongue? must you double-tongue? must they double-tongue?	must I be double-tonguing? must you be double-tonguing? must she be double-tonguing? must we be double-tonguing? must you be double-tonguing? must they be double-tonguing?
Perfect	V-ing perfect
must I have double-tongued? must you have double-tongued? must she have double-tongued? must we have double-tongued? must you have double-tongued? must they have double-tongued?	must I have been double-tonguing? must you have been double-tonguing? must she have been double-tonguing? must we have been double-tonguing? must you have been double-tonguing? must they have been double-tonguing?

Interro-negative form

Simple form	V-ing form
mustn't I double-tongue? mustn't you double-tongue? mustn't she double-tongue? mustn't we double-tongue? mustn't you double-tongue? mustn't they double-tongue?	mustn't I be double-tonguing? mustn't you be double-tonguing? mustn't she be double-tonguing? mustn't we be double-tonguing? mustn't you be double-tonguing? mustn't they be double-tonguing?
Perfect	V-ing perfect
mustn't I have double-tongued? mustn't you have double-tongued? mustn't she have double-tongued? mustn't we have double-tongued? mustn't you have double-tongued? mustn't they have double-tongued?	mustn't I have been double-tonguing? mustn't you have been double-tonguing? mustn't she have been double-tonguing? mustn't we have been double-tonguing? mustn't you have been double-tonguing? mustn't they have been double-tonguing?