English verb conjugation
MUST SPUR

Regular verb: spur - spurred - spurred

Affirmation

Simple form	V-ing form
I must spur you must spur he must spur we must spur you must spur they must spur	I must be spurring you must be spurring he must be spurring we must be spurring you must be spurring they must be spurring
Perfect	V-ing perfect
I must have spurred you must have spurred he must have spurred we must have spurred you must have spurred they must have spurred	I must have been spurring you must have been spurring he must have been spurring we must have been spurring you must have been spurring they must have been spurring

Negation

Simple form	V-ing form
I mustn't spur you mustn't spur he mustn't spur we mustn't spur you mustn't spur they mustn't spur	I mustn't be spurring you mustn't be spurring he mustn't be spurring we mustn't be spurring you mustn't be spurring they mustn't be spurring
Perfect	V-ing perfect
I mustn't have spurred you mustn't have spurred he mustn't have spurred we mustn't have spurred you mustn't have spurred they mustn't have spurred	I mustn't have been spurring you mustn't have been spurring he mustn't have been spurring we mustn't have been spurring you mustn't have been spurring they mustn't have been spurring

Interrogative form

Simple form	V-ing form
must I spur? must you spur? must he spur? must we spur? must you spur? must they spur?	must I be spurring? must you be spurring? must he be spurring? must we be spurring? must you be spurring? must they be spurring?
Perfect	V-ing perfect
must I have spurred? must you have spurred? must he have spurred? must we have spurred? must you have spurred? must they have spurred?	must I have been spurring? must you have been spurring? must he have been spurring? must we have been spurring? must you have been spurring? must they have been spurring?

Interro-negative form

Simple form	V-ing form
mustn't I spur? mustn't you spur? mustn't he spur? mustn't we spur? mustn't you spur? mustn't they spur?	mustn't I be spurring? mustn't you be spurring? mustn't he be spurring? mustn't we be spurring? mustn't you be spurring? mustn't they be spurring?
Perfect	V-ing perfect
mustn't I have spurred? mustn't you have spurred? mustn't he have spurred? mustn't we have spurred? mustn't you have spurred? mustn't they have spurred?	mustn't I have been spurring? mustn't you have been spurring? mustn't he have been spurring? mustn't we have been spurring? mustn't you have been spurring? mustn't they have been spurring?