English verb conjugation
MUST FRIBBLE

Regular verb: fribble - fribbled - fribbled

Affirmation

Simple form	V-ing form
I must fribble you must fribble he must fribble we must fribble you must fribble they must fribble	I must be fribbling you must be fribbling he must be fribbling we must be fribbling you must be fribbling they must be fribbling
Perfect	V-ing perfect
I must have fribbled you must have fribbled he must have fribbled we must have fribbled you must have fribbled they must have fribbled	I must have been fribbling you must have been fribbling he must have been fribbling we must have been fribbling you must have been fribbling they must have been fribbling

Negation

Simple form	V-ing form
I mustn't fribble you mustn't fribble he mustn't fribble we mustn't fribble you mustn't fribble they mustn't fribble	I mustn't be fribbling you mustn't be fribbling he mustn't be fribbling we mustn't be fribbling you mustn't be fribbling they mustn't be fribbling
Perfect	V-ing perfect
I mustn't have fribbled you mustn't have fribbled he mustn't have fribbled we mustn't have fribbled you mustn't have fribbled they mustn't have fribbled	I mustn't have been fribbling you mustn't have been fribbling he mustn't have been fribbling we mustn't have been fribbling you mustn't have been fribbling they mustn't have been fribbling

Interrogative form

Simple form	V-ing form
must I fribble? must you fribble? must he fribble? must we fribble? must you fribble? must they fribble?	must I be fribbling? must you be fribbling? must he be fribbling? must we be fribbling? must you be fribbling? must they be fribbling?
Perfect	V-ing perfect
must I have fribbled? must you have fribbled? must he have fribbled? must we have fribbled? must you have fribbled? must they have fribbled?	must I have been fribbling? must you have been fribbling? must he have been fribbling? must we have been fribbling? must you have been fribbling? must they have been fribbling?

Interro-negative form

Simple form	V-ing form
mustn't I fribble? mustn't you fribble? mustn't he fribble? mustn't we fribble? mustn't you fribble? mustn't they fribble?	mustn't I be fribbling? mustn't you be fribbling? mustn't he be fribbling? mustn't we be fribbling? mustn't you be fribbling? mustn't they be fribbling?
Perfect	V-ing perfect
mustn't I have fribbled? mustn't you have fribbled? mustn't he have fribbled? mustn't we have fribbled? mustn't you have fribbled? mustn't they have fribbled?	mustn't I have been fribbling? mustn't you have been fribbling? mustn't he have been fribbling? mustn't we have been fribbling? mustn't you have been fribbling? mustn't they have been fribbling?