English verb conjugation
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Regular verb: look - looked - looked

Affirmation

Simple form	V-ing form
I must look you must look he must look we must look you must look they must look	I must be looking you must be looking he must be looking we must be looking you must be looking they must be looking
Perfect	V-ing perfect
I must have looked you must have looked he must have looked we must have looked you must have looked they must have looked	I must have been looking you must have been looking he must have been looking we must have been looking you must have been looking they must have been looking

Negation

Simple form	V-ing form
I must not look you must not look he must not look we must not look you must not look they must not look	I must not be looking you must not be looking he must not be looking we must not be looking you must not be looking they must not be looking
Perfect	V-ing perfect
I must not have looked you must not have looked he must not have looked we must not have looked you must not have looked they must not have looked	I must not have been looking you must not have been looking he must not have been looking we must not have been looking you must not have been looking they must not have been looking

Interrogative form

Simple form	V-ing form
must I look? must you look? must he look? must we look? must you look? must they look?	must I be looking? must you be looking? must he be looking? must we be looking? must you be looking? must they be looking?
Perfect	V-ing perfect
must I have looked? must you have looked? must he have looked? must we have looked? must you have looked? must they have looked?	must I have been looking? must you have been looking? must he have been looking? must we have been looking? must you have been looking? must they have been looking?

Interro-negative form

Simple form	V-ing form
must I not look? must you not look? must he not look? must we not look? must you not look? must they not look?	must I not be looking? must you not be looking? must he not be looking? must we not be looking? must you not be looking? must they not be looking?
Perfect	V-ing perfect
must I not have looked? must you not have looked? must he not have looked? must we not have looked? must you not have looked? must they not have looked?	must I not have been looking? must you not have been looking? must he not have been looking? must we not have been looking? must you not have been looking? must they not have been looking?