English verb conjugation
MUST SCAB

Regular verb: scab - scabbed - scabbed

Affirmation

Simple form	V-ing form
I must scab you must scab she must scab we must scab you must scab they must scab	I must be scabbing you must be scabbing she must be scabbing we must be scabbing you must be scabbing they must be scabbing
Perfect	V-ing perfect
I must have scabbed you must have scabbed she must have scabbed we must have scabbed you must have scabbed they must have scabbed	I must have been scabbing you must have been scabbing she must have been scabbing we must have been scabbing you must have been scabbing they must have been scabbing

Negation

Simple form	V-ing form
I mustn't scab you mustn't scab she mustn't scab we mustn't scab you mustn't scab they mustn't scab	I mustn't be scabbing you mustn't be scabbing she mustn't be scabbing we mustn't be scabbing you mustn't be scabbing they mustn't be scabbing
Perfect	V-ing perfect
I mustn't have scabbed you mustn't have scabbed she mustn't have scabbed we mustn't have scabbed you mustn't have scabbed they mustn't have scabbed	I mustn't have been scabbing you mustn't have been scabbing she mustn't have been scabbing we mustn't have been scabbing you mustn't have been scabbing they mustn't have been scabbing

Interrogative form

Simple form	V-ing form
must I scab? must you scab? must she scab? must we scab? must you scab? must they scab?	must I be scabbing? must you be scabbing? must she be scabbing? must we be scabbing? must you be scabbing? must they be scabbing?
Perfect	V-ing perfect
must I have scabbed? must you have scabbed? must she have scabbed? must we have scabbed? must you have scabbed? must they have scabbed?	must I have been scabbing? must you have been scabbing? must she have been scabbing? must we have been scabbing? must you have been scabbing? must they have been scabbing?

Interro-negative form

Simple form	V-ing form
mustn't I scab? mustn't you scab? mustn't she scab? mustn't we scab? mustn't you scab? mustn't they scab?	mustn't I be scabbing? mustn't you be scabbing? mustn't she be scabbing? mustn't we be scabbing? mustn't you be scabbing? mustn't they be scabbing?
Perfect	V-ing perfect
mustn't I have scabbed? mustn't you have scabbed? mustn't she have scabbed? mustn't we have scabbed? mustn't you have scabbed? mustn't they have scabbed?	mustn't I have been scabbing? mustn't you have been scabbing? mustn't she have been scabbing? mustn't we have been scabbing? mustn't you have been scabbing? mustn't they have been scabbing?