English verb conjugation
MUST TWITCH

Regular verb: twitch - twitched - twitched

Affirmation

Simple form	V-ing form
I must twitch you must twitch she must twitch we must twitch you must twitch they must twitch	I must be twitching you must be twitching she must be twitching we must be twitching you must be twitching they must be twitching
Perfect	V-ing perfect
I must have twitched you must have twitched she must have twitched we must have twitched you must have twitched they must have twitched	I must have been twitching you must have been twitching she must have been twitching we must have been twitching you must have been twitching they must have been twitching

Negation

Simple form	V-ing form
I mustn't twitch you mustn't twitch she mustn't twitch we mustn't twitch you mustn't twitch they mustn't twitch	I mustn't be twitching you mustn't be twitching she mustn't be twitching we mustn't be twitching you mustn't be twitching they mustn't be twitching
Perfect	V-ing perfect
I mustn't have twitched you mustn't have twitched she mustn't have twitched we mustn't have twitched you mustn't have twitched they mustn't have twitched	I mustn't have been twitching you mustn't have been twitching she mustn't have been twitching we mustn't have been twitching you mustn't have been twitching they mustn't have been twitching

Interrogative form

Simple form	V-ing form
must I twitch? must you twitch? must she twitch? must we twitch? must you twitch? must they twitch?	must I be twitching? must you be twitching? must she be twitching? must we be twitching? must you be twitching? must they be twitching?
Perfect	V-ing perfect
must I have twitched? must you have twitched? must she have twitched? must we have twitched? must you have twitched? must they have twitched?	must I have been twitching? must you have been twitching? must she have been twitching? must we have been twitching? must you have been twitching? must they have been twitching?

Interro-negative form

Simple form	V-ing form
mustn't I twitch? mustn't you twitch? mustn't she twitch? mustn't we twitch? mustn't you twitch? mustn't they twitch?	mustn't I be twitching? mustn't you be twitching? mustn't she be twitching? mustn't we be twitching? mustn't you be twitching? mustn't they be twitching?
Perfect	V-ing perfect
mustn't I have twitched? mustn't you have twitched? mustn't she have twitched? mustn't we have twitched? mustn't you have twitched? mustn't they have twitched?	mustn't I have been twitching? mustn't you have been twitching? mustn't she have been twitching? mustn't we have been twitching? mustn't you have been twitching? mustn't they have been twitching?