must ponder
Regular verb: ponder - pondered- pondered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must ponder
you must ponder
she must ponder
we must ponder
you must ponder
they must ponder 	I must be pondering
you must be pondering
she must be pondering
we must be pondering
you must be pondering
they must be pondering	I must have pondered
you must have pondered
she 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
she 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 	Perfect 	V-ing perfect 	
I mustn't ponder
you mustn't ponder
she mustn't ponder
we mustn't ponder
you mustn't ponder
they mustn't ponder 	I mustn't be pondering
you mustn't be pondering
she mustn't be pondering
we mustn't be pondering
you mustn't be pondering
they mustn't be pondering	I mustn't have pondered
you mustn't have pondered
she mustn't have pondered
we mustn't have pondered
you mustn't have pondered
they mustn't have pondered	I mustn't have been pondering
you mustn't have been pondering
she mustn't have been pondering
we mustn't have been pondering
you mustn't have been pondering
they mustn't have been pondering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I ponder?
must you ponder?
must she ponder?
must we ponder?
must you ponder?
must they ponder? 	must I be pondering?
must you be pondering?
must she be pondering?
must we be pondering?
must you be pondering?
must they be pondering? 	must I have pondered?
must you have pondered?
must she 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 she 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 	Perfect 	V-ing perfect 	
mustn't I ponder?
mustn't you ponder?
mustn't she ponder?
mustn't we ponder?
mustn't you ponder?
mustn't they ponder? 	mustn't I be pondering?
mustn't you be pondering?
mustn't she be pondering?
mustn't we be pondering?
mustn't you be pondering?
mustn't they be pondering? 	mustn't I have pondered?
mustn't you have pondered?
mustn't she have pondered?
mustn't we have pondered?
mustn't you have pondered?
mustn't they have pondered? 	mustn't I have been pondering?
mustn't you have been pondering?
mustn't she have been pondering?
mustn't we have been pondering?
mustn't you have been pondering?
mustn't they have been pondering?