English verb conjugation
MUST SQUABBLE

Regular verb: squabble - squabbled - squabbled

Affirmation

Simple form	V-ing form
I must squabble you must squabble he must squabble we must squabble you must squabble they must squabble	I must be squabbling you must be squabbling he must be squabbling we must be squabbling you must be squabbling they must be squabbling
Perfect	V-ing perfect
I must have squabbled you must have squabbled he must have squabbled we must have squabbled you must have squabbled they must have squabbled	I must have been squabbling you must have been squabbling he must have been squabbling we must have been squabbling you must have been squabbling they must have been squabbling

Negation

Simple form	V-ing form
I mustn't squabble you mustn't squabble he mustn't squabble we mustn't squabble you mustn't squabble they mustn't squabble	I mustn't be squabbling you mustn't be squabbling he mustn't be squabbling we mustn't be squabbling you mustn't be squabbling they mustn't be squabbling
Perfect	V-ing perfect
I mustn't have squabbled you mustn't have squabbled he mustn't have squabbled we mustn't have squabbled you mustn't have squabbled they mustn't have squabbled	I mustn't have been squabbling you mustn't have been squabbling he mustn't have been squabbling we mustn't have been squabbling you mustn't have been squabbling they mustn't have been squabbling

Interrogative form

Simple form	V-ing form
must I squabble? must you squabble? must he squabble? must we squabble? must you squabble? must they squabble?	must I be squabbling? must you be squabbling? must he be squabbling? must we be squabbling? must you be squabbling? must they be squabbling?
Perfect	V-ing perfect
must I have squabbled? must you have squabbled? must he have squabbled? must we have squabbled? must you have squabbled? must they have squabbled?	must I have been squabbling? must you have been squabbling? must he have been squabbling? must we have been squabbling? must you have been squabbling? must they have been squabbling?

Interro-negative form

Simple form	V-ing form
mustn't I squabble? mustn't you squabble? mustn't he squabble? mustn't we squabble? mustn't you squabble? mustn't they squabble?	mustn't I be squabbling? mustn't you be squabbling? mustn't he be squabbling? mustn't we be squabbling? mustn't you be squabbling? mustn't they be squabbling?
Perfect	V-ing perfect
mustn't I have squabbled? mustn't you have squabbled? mustn't he have squabbled? mustn't we have squabbled? mustn't you have squabbled? mustn't they have squabbled?	mustn't I have been squabbling? mustn't you have been squabbling? mustn't he have been squabbling? mustn't we have been squabbling? mustn't you have been squabbling? mustn't they have been squabbling?