English verb conjugation
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Regular verb: burl - burled - burled

Affirmation

Simple form	V-ing form
I must burl you must burl he must burl we must burl you must burl they must burl	I must be burling you must be burling he must be burling we must be burling you must be burling they must be burling
Perfect	V-ing perfect
I must have burled you must have burled he must have burled we must have burled you must have burled they must have burled	I must have been burling you must have been burling he must have been burling we must have been burling you must have been burling they must have been burling

Negation

Simple form	V-ing form
I mustn't burl you mustn't burl he mustn't burl we mustn't burl you mustn't burl they mustn't burl	I mustn't be burling you mustn't be burling he mustn't be burling we mustn't be burling you mustn't be burling they mustn't be burling
Perfect	V-ing perfect
I mustn't have burled you mustn't have burled he mustn't have burled we mustn't have burled you mustn't have burled they mustn't have burled	I mustn't have been burling you mustn't have been burling he mustn't have been burling we mustn't have been burling you mustn't have been burling they mustn't have been burling

Interrogative form

Simple form	V-ing form
must I burl? must you burl? must he burl? must we burl? must you burl? must they burl?	must I be burling? must you be burling? must he be burling? must we be burling? must you be burling? must they be burling?
Perfect	V-ing perfect
must I have burled? must you have burled? must he have burled? must we have burled? must you have burled? must they have burled?	must I have been burling? must you have been burling? must he have been burling? must we have been burling? must you have been burling? must they have been burling?

Interro-negative form

Simple form	V-ing form
mustn't I burl? mustn't you burl? mustn't he burl? mustn't we burl? mustn't you burl? mustn't they burl?	mustn't I be burling? mustn't you be burling? mustn't he be burling? mustn't we be burling? mustn't you be burling? mustn't they be burling?
Perfect	V-ing perfect
mustn't I have burled? mustn't you have burled? mustn't he have burled? mustn't we have burled? mustn't you have burled? mustn't they have burled?	mustn't I have been burling? mustn't you have been burling? mustn't he have been burling? mustn't we have been burling? mustn't you have been burling? mustn't they have been burling?