English verb conjugation
MUST KNURL

Regular verb: knurl - knurled - knurled

Affirmation

Simple form	V-ing form
I must knurl you must knurl he must knurl we must knurl you must knurl they must knurl	I must be knurling you must be knurling he must be knurling we must be knurling you must be knurling they must be knurling
Perfect	V-ing perfect
I must have knurled you must have knurled he must have knurled we must have knurled you must have knurled they must have knurled	I must have been knurling you must have been knurling he must have been knurling we must have been knurling you must have been knurling they must have been knurling

Negation

Simple form	V-ing form
I mustn't knurl you mustn't knurl he mustn't knurl we mustn't knurl you mustn't knurl they mustn't knurl	I mustn't be knurling you mustn't be knurling he mustn't be knurling we mustn't be knurling you mustn't be knurling they mustn't be knurling
Perfect	V-ing perfect
I mustn't have knurled you mustn't have knurled he mustn't have knurled we mustn't have knurled you mustn't have knurled they mustn't have knurled	I mustn't have been knurling you mustn't have been knurling he mustn't have been knurling we mustn't have been knurling you mustn't have been knurling they mustn't have been knurling

Interrogative form

Simple form	V-ing form
must I knurl? must you knurl? must he knurl? must we knurl? must you knurl? must they knurl?	must I be knurling? must you be knurling? must he be knurling? must we be knurling? must you be knurling? must they be knurling?
Perfect	V-ing perfect
must I have knurled? must you have knurled? must he have knurled? must we have knurled? must you have knurled? must they have knurled?	must I have been knurling? must you have been knurling? must he have been knurling? must we have been knurling? must you have been knurling? must they have been knurling?

Interro-negative form

Simple form	V-ing form
mustn't I knurl? mustn't you knurl? mustn't he knurl? mustn't we knurl? mustn't you knurl? mustn't they knurl?	mustn't I be knurling? mustn't you be knurling? mustn't he be knurling? mustn't we be knurling? mustn't you be knurling? mustn't they be knurling?
Perfect	V-ing perfect
mustn't I have knurled? mustn't you have knurled? mustn't he have knurled? mustn't we have knurled? mustn't you have knurled? mustn't they have knurled?	mustn't I have been knurling? mustn't you have been knurling? mustn't he have been knurling? mustn't we have been knurling? mustn't you have been knurling? mustn't they have been knurling?