English verb conjugation
MUST CRAB

Regular verb: crab - crabbed - crabbed

Affirmation

Simple form	V-ing form
I must crab you must crab she must crab we must crab you must crab they must crab	I must be crabbing you must be crabbing she must be crabbing we must be crabbing you must be crabbing they must be crabbing
Perfect	V-ing perfect
I must have crabbed you must have crabbed she must have crabbed we must have crabbed you must have crabbed they must have crabbed	I must have been crabbing you must have been crabbing she must have been crabbing we must have been crabbing you must have been crabbing they must have been crabbing

Negation

Simple form	V-ing form
I mustn't crab you mustn't crab she mustn't crab we mustn't crab you mustn't crab they mustn't crab	I mustn't be crabbing you mustn't be crabbing she mustn't be crabbing we mustn't be crabbing you mustn't be crabbing they mustn't be crabbing
Perfect	V-ing perfect
I mustn't have crabbed you mustn't have crabbed she mustn't have crabbed we mustn't have crabbed you mustn't have crabbed they mustn't have crabbed	I mustn't have been crabbing you mustn't have been crabbing she mustn't have been crabbing we mustn't have been crabbing you mustn't have been crabbing they mustn't have been crabbing

Interrogative form

Simple form	V-ing form
must I crab? must you crab? must she crab? must we crab? must you crab? must they crab?	must I be crabbing? must you be crabbing? must she be crabbing? must we be crabbing? must you be crabbing? must they be crabbing?
Perfect	V-ing perfect
must I have crabbed? must you have crabbed? must she have crabbed? must we have crabbed? must you have crabbed? must they have crabbed?	must I have been crabbing? must you have been crabbing? must she have been crabbing? must we have been crabbing? must you have been crabbing? must they have been crabbing?

Interro-negative form

Simple form	V-ing form
mustn't I crab? mustn't you crab? mustn't she crab? mustn't we crab? mustn't you crab? mustn't they crab?	mustn't I be crabbing? mustn't you be crabbing? mustn't she be crabbing? mustn't we be crabbing? mustn't you be crabbing? mustn't they be crabbing?
Perfect	V-ing perfect
mustn't I have crabbed? mustn't you have crabbed? mustn't she have crabbed? mustn't we have crabbed? mustn't you have crabbed? mustn't they have crabbed?	mustn't I have been crabbing? mustn't you have been crabbing? mustn't she have been crabbing? mustn't we have been crabbing? mustn't you have been crabbing? mustn't they have been crabbing?