English verb conjugation
MUST PONDER

Regular verb: ponder - pondered - pondered

Affirmation

Simple form	V-ing form
I must ponder you must ponder he must ponder we must ponder you must ponder they must ponder	I must be pondering you must be pondering he must be pondering we must be pondering you must be pondering they must be pondering
Perfect	V-ing perfect
I must have pondered you must have pondered he must have pondered we must have pondered you must have pondered they must have pondered	I must have been pondering you must have been pondering he must have been pondering we must have been pondering you must have been pondering they must have been pondering

Negation

Simple form	V-ing form
I must not ponder you must not ponder he must not ponder we must not ponder you must not ponder they must not ponder	I must not be pondering you must not be pondering he must not be pondering we must not be pondering you must not be pondering they must not be pondering
Perfect	V-ing perfect
I must not have pondered you must not have pondered he must not have pondered we must not have pondered you must not have pondered they must not have pondered	I must not have been pondering you must not have been pondering he must not have been pondering we must not have been pondering you must not have been pondering they must not have been pondering

Interrogative form

Simple form	V-ing form
must I ponder? must you ponder? must he ponder? must we ponder? must you ponder? must they ponder?	must I be pondering? must you be pondering? must he be pondering? must we be pondering? must you be pondering? must they be pondering?
Perfect	V-ing perfect
must I have pondered? must you have pondered? must he have pondered? must we have pondered? must you have pondered? must they have pondered?	must I have been pondering? must you have been pondering? must he have been pondering? must we have been pondering? must you have been pondering? must they have been pondering?

Interro-negative form

Simple form	V-ing form
must I not ponder? must you not ponder? must he not ponder? must we not ponder? must you not ponder? must they not ponder?	must I not be pondering? must you not be pondering? must he not be pondering? must we not be pondering? must you not be pondering? must they not be pondering?
Perfect	V-ing perfect
must I not have pondered? must you not have pondered? must he not have pondered? must we not have pondered? must you not have pondered? must they not have pondered?	must I not have been pondering? must you not have been pondering? must he not have been pondering? must we not have been pondering? must you not have been pondering? must they not have been pondering?