English verb conjugation
MUST SHORTEN

Regular verb: shorten - shortened - shortened

Affirmation

Simple form	V-ing form
I must shorten you must shorten she must shorten we must shorten you must shorten they must shorten	I must be shortening you must be shortening she must be shortening we must be shortening you must be shortening they must be shortening
Perfect	V-ing perfect
I must have shortened you must have shortened she must have shortened we must have shortened you must have shortened they must have shortened	I must have been shortening you must have been shortening she must have been shortening we must have been shortening you must have been shortening they must have been shortening

Negation

Simple form	V-ing form
I mustn't shorten you mustn't shorten she mustn't shorten we mustn't shorten you mustn't shorten they mustn't shorten	I mustn't be shortening you mustn't be shortening she mustn't be shortening we mustn't be shortening you mustn't be shortening they mustn't be shortening
Perfect	V-ing perfect
I mustn't have shortened you mustn't have shortened she mustn't have shortened we mustn't have shortened you mustn't have shortened they mustn't have shortened	I mustn't have been shortening you mustn't have been shortening she mustn't have been shortening we mustn't have been shortening you mustn't have been shortening they mustn't have been shortening

Interrogative form

Simple form	V-ing form
must I shorten? must you shorten? must she shorten? must we shorten? must you shorten? must they shorten?	must I be shortening? must you be shortening? must she be shortening? must we be shortening? must you be shortening? must they be shortening?
Perfect	V-ing perfect
must I have shortened? must you have shortened? must she have shortened? must we have shortened? must you have shortened? must they have shortened?	must I have been shortening? must you have been shortening? must she have been shortening? must we have been shortening? must you have been shortening? must they have been shortening?

Interro-negative form

Simple form	V-ing form
mustn't I shorten? mustn't you shorten? mustn't she shorten? mustn't we shorten? mustn't you shorten? mustn't they shorten?	mustn't I be shortening? mustn't you be shortening? mustn't she be shortening? mustn't we be shortening? mustn't you be shortening? mustn't they be shortening?
Perfect	V-ing perfect
mustn't I have shortened? mustn't you have shortened? mustn't she have shortened? mustn't we have shortened? mustn't you have shortened? mustn't they have shortened?	mustn't I have been shortening? mustn't you have been shortening? mustn't she have been shortening? mustn't we have been shortening? mustn't you have been shortening? mustn't they have been shortening?