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 must not crab you must not crab she must not crab we must not crab you must not crab they must not crab	I must not be crabbing you must not be crabbing she must not be crabbing we must not be crabbing you must not be crabbing they must not be crabbing
Perfect	V-ing perfect
I must not have crabbed you must not have crabbed she must not have crabbed we must not have crabbed you must not have crabbed they must not have crabbed	I must not have been crabbing you must not have been crabbing she must not have been crabbing we must not have been crabbing you must not have been crabbing they must not 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
must I not crab? must you not crab? must she not crab? must we not crab? must you not crab? must they not crab?	must I not be crabbing? must you not be crabbing? must she not be crabbing? must we not be crabbing? must you not be crabbing? must they not be crabbing?
Perfect	V-ing perfect
must I not have crabbed? must you not have crabbed? must she not have crabbed? must we not have crabbed? must you not have crabbed? must they not have crabbed?	must I not have been crabbing? must you not have been crabbing? must she not have been crabbing? must we not have been crabbing? must you not have been crabbing? must they not have been crabbing?