English verb conjugation
MUST SNOWPLOUGH

Regular verb: snowplough - snowploughed - snowploughed

Affirmation

Simple form	V-ing form
I must snowplough you must snowplough he must snowplough we must snowplough you must snowplough they must snowplough	I must be snowploughing you must be snowploughing he must be snowploughing we must be snowploughing you must be snowploughing they must be snowploughing
Perfect	V-ing perfect
I must have snowploughed you must have snowploughed he must have snowploughed we must have snowploughed you must have snowploughed they must have snowploughed	I must have been snowploughing you must have been snowploughing he must have been snowploughing we must have been snowploughing you must have been snowploughing they must have been snowploughing

Negation

Simple form	V-ing form
I mustn't snowplough you mustn't snowplough he mustn't snowplough we mustn't snowplough you mustn't snowplough they mustn't snowplough	I mustn't be snowploughing you mustn't be snowploughing he mustn't be snowploughing we mustn't be snowploughing you mustn't be snowploughing they mustn't be snowploughing
Perfect	V-ing perfect
I mustn't have snowploughed you mustn't have snowploughed he mustn't have snowploughed we mustn't have snowploughed you mustn't have snowploughed they mustn't have snowploughed	I mustn't have been snowploughing you mustn't have been snowploughing he mustn't have been snowploughing we mustn't have been snowploughing you mustn't have been snowploughing they mustn't have been snowploughing

Interrogative form

Simple form	V-ing form
must I snowplough? must you snowplough? must he snowplough? must we snowplough? must you snowplough? must they snowplough?	must I be snowploughing? must you be snowploughing? must he be snowploughing? must we be snowploughing? must you be snowploughing? must they be snowploughing?
Perfect	V-ing perfect
must I have snowploughed? must you have snowploughed? must he have snowploughed? must we have snowploughed? must you have snowploughed? must they have snowploughed?	must I have been snowploughing? must you have been snowploughing? must he have been snowploughing? must we have been snowploughing? must you have been snowploughing? must they have been snowploughing?

Interro-negative form

Simple form	V-ing form
mustn't I snowplough? mustn't you snowplough? mustn't he snowplough? mustn't we snowplough? mustn't you snowplough? mustn't they snowplough?	mustn't I be snowploughing? mustn't you be snowploughing? mustn't he be snowploughing? mustn't we be snowploughing? mustn't you be snowploughing? mustn't they be snowploughing?
Perfect	V-ing perfect
mustn't I have snowploughed? mustn't you have snowploughed? mustn't he have snowploughed? mustn't we have snowploughed? mustn't you have snowploughed? mustn't they have snowploughed?	mustn't I have been snowploughing? mustn't you have been snowploughing? mustn't he have been snowploughing? mustn't we have been snowploughing? mustn't you have been snowploughing? mustn't they have been snowploughing?