English verb conjugation
MUST TREMBLE

Regular verb: tremble - trembled - trembled

Affirmation

Simple form	V-ing form
I must tremble you must tremble he must tremble we must tremble you must tremble they must tremble	I must be trembling you must be trembling he must be trembling we must be trembling you must be trembling they must be trembling
Perfect	V-ing perfect
I must have trembled you must have trembled he must have trembled we must have trembled you must have trembled they must have trembled	I must have been trembling you must have been trembling he must have been trembling we must have been trembling you must have been trembling they must have been trembling

Negation

Simple form	V-ing form
I mustn't tremble you mustn't tremble he mustn't tremble we mustn't tremble you mustn't tremble they mustn't tremble	I mustn't be trembling you mustn't be trembling he mustn't be trembling we mustn't be trembling you mustn't be trembling they mustn't be trembling
Perfect	V-ing perfect
I mustn't have trembled you mustn't have trembled he mustn't have trembled we mustn't have trembled you mustn't have trembled they mustn't have trembled	I mustn't have been trembling you mustn't have been trembling he mustn't have been trembling we mustn't have been trembling you mustn't have been trembling they mustn't have been trembling

Interrogative form

Simple form	V-ing form
must I tremble? must you tremble? must he tremble? must we tremble? must you tremble? must they tremble?	must I be trembling? must you be trembling? must he be trembling? must we be trembling? must you be trembling? must they be trembling?
Perfect	V-ing perfect
must I have trembled? must you have trembled? must he have trembled? must we have trembled? must you have trembled? must they have trembled?	must I have been trembling? must you have been trembling? must he have been trembling? must we have been trembling? must you have been trembling? must they have been trembling?

Interro-negative form

Simple form	V-ing form
mustn't I tremble? mustn't you tremble? mustn't he tremble? mustn't we tremble? mustn't you tremble? mustn't they tremble?	mustn't I be trembling? mustn't you be trembling? mustn't he be trembling? mustn't we be trembling? mustn't you be trembling? mustn't they be trembling?
Perfect	V-ing perfect
mustn't I have trembled? mustn't you have trembled? mustn't he have trembled? mustn't we have trembled? mustn't you have trembled? mustn't they have trembled?	mustn't I have been trembling? mustn't you have been trembling? mustn't he have been trembling? mustn't we have been trembling? mustn't you have been trembling? mustn't they have been trembling?