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 must not burl you must not burl he must not burl we must not burl you must not burl they must not burl	I must not be burling you must not be burling he must not be burling we must not be burling you must not be burling they must not be burling
Perfect	V-ing perfect
I must not have burled you must not have burled he must not have burled we must not have burled you must not have burled they must not have burled	I must not have been burling you must not have been burling he must not have been burling we must not have been burling you must not have been burling they must not 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
must I not burl? must you not burl? must he not burl? must we not burl? must you not burl? must they not burl?	must I not be burling? must you not be burling? must he not be burling? must we not be burling? must you not be burling? must they not be burling?
Perfect	V-ing perfect
must I not have burled? must you not have burled? must he not have burled? must we not have burled? must you not have burled? must they not have burled?	must I not have been burling? must you not have been burling? must he not have been burling? must we not have been burling? must you not have been burling? must they not have been burling?