English verb conjugation
MUST TRIP

Regular verb: trip - tripped - tripped

Affirmation

Simple form	V-ing form
I must trip you must trip she must trip we must trip you must trip they must trip	I must be tripping you must be tripping she must be tripping we must be tripping you must be tripping they must be tripping
Perfect	V-ing perfect
I must have tripped you must have tripped she must have tripped we must have tripped you must have tripped they must have tripped	I must have been tripping you must have been tripping she must have been tripping we must have been tripping you must have been tripping they must have been tripping

Negation

Simple form	V-ing form
I mustn't trip you mustn't trip she mustn't trip we mustn't trip you mustn't trip they mustn't trip	I mustn't be tripping you mustn't be tripping she mustn't be tripping we mustn't be tripping you mustn't be tripping they mustn't be tripping
Perfect	V-ing perfect
I mustn't have tripped you mustn't have tripped she mustn't have tripped we mustn't have tripped you mustn't have tripped they mustn't have tripped	I mustn't have been tripping you mustn't have been tripping she mustn't have been tripping we mustn't have been tripping you mustn't have been tripping they mustn't have been tripping

Interrogative form

Simple form	V-ing form
must I trip? must you trip? must she trip? must we trip? must you trip? must they trip?	must I be tripping? must you be tripping? must she be tripping? must we be tripping? must you be tripping? must they be tripping?
Perfect	V-ing perfect
must I have tripped? must you have tripped? must she have tripped? must we have tripped? must you have tripped? must they have tripped?	must I have been tripping? must you have been tripping? must she have been tripping? must we have been tripping? must you have been tripping? must they have been tripping?

Interro-negative form

Simple form	V-ing form
mustn't I trip? mustn't you trip? mustn't she trip? mustn't we trip? mustn't you trip? mustn't they trip?	mustn't I be tripping? mustn't you be tripping? mustn't she be tripping? mustn't we be tripping? mustn't you be tripping? mustn't they be tripping?
Perfect	V-ing perfect
mustn't I have tripped? mustn't you have tripped? mustn't she have tripped? mustn't we have tripped? mustn't you have tripped? mustn't they have tripped?	mustn't I have been tripping? mustn't you have been tripping? mustn't she have been tripping? mustn't we have been tripping? mustn't you have been tripping? mustn't they have been tripping?