English verb conjugation
MUST BUBBLE

Regular verb: bubble - bubbled - bubbled

Affirmation

Simple form	V-ing form
I must bubble you must bubble he must bubble we must bubble you must bubble they must bubble	I must be bubbling you must be bubbling he must be bubbling we must be bubbling you must be bubbling they must be bubbling
Perfect	V-ing perfect
I must have bubbled you must have bubbled he must have bubbled we must have bubbled you must have bubbled they must have bubbled	I must have been bubbling you must have been bubbling he must have been bubbling we must have been bubbling you must have been bubbling they must have been bubbling

Negation

Simple form	V-ing form
I mustn't bubble you mustn't bubble he mustn't bubble we mustn't bubble you mustn't bubble they mustn't bubble	I mustn't be bubbling you mustn't be bubbling he mustn't be bubbling we mustn't be bubbling you mustn't be bubbling they mustn't be bubbling
Perfect	V-ing perfect
I mustn't have bubbled you mustn't have bubbled he mustn't have bubbled we mustn't have bubbled you mustn't have bubbled they mustn't have bubbled	I mustn't have been bubbling you mustn't have been bubbling he mustn't have been bubbling we mustn't have been bubbling you mustn't have been bubbling they mustn't have been bubbling

Interrogative form

Simple form	V-ing form
must I bubble? must you bubble? must he bubble? must we bubble? must you bubble? must they bubble?	must I be bubbling? must you be bubbling? must he be bubbling? must we be bubbling? must you be bubbling? must they be bubbling?
Perfect	V-ing perfect
must I have bubbled? must you have bubbled? must he have bubbled? must we have bubbled? must you have bubbled? must they have bubbled?	must I have been bubbling? must you have been bubbling? must he have been bubbling? must we have been bubbling? must you have been bubbling? must they have been bubbling?

Interro-negative form

Simple form	V-ing form
mustn't I bubble? mustn't you bubble? mustn't he bubble? mustn't we bubble? mustn't you bubble? mustn't they bubble?	mustn't I be bubbling? mustn't you be bubbling? mustn't he be bubbling? mustn't we be bubbling? mustn't you be bubbling? mustn't they be bubbling?
Perfect	V-ing perfect
mustn't I have bubbled? mustn't you have bubbled? mustn't he have bubbled? mustn't we have bubbled? mustn't you have bubbled? mustn't they have bubbled?	mustn't I have been bubbling? mustn't you have been bubbling? mustn't he have been bubbling? mustn't we have been bubbling? mustn't you have been bubbling? mustn't they have been bubbling?