must experiment
Verbo regular: experiment - experimented- experimented

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must experiment
you must experiment
he must experiment
we must experiment
you must experiment
they must experiment 	I must be experimenting
you must be experimenting
he must be experimenting
we must be experimenting
you must be experimenting
they must be experimenting	I must have experimented
you must have experimented
he must have experimented
we must have experimented
you must have experimented
they must have experimented	I must have been experimenting
you must have been experimenting
he must have been experimenting
we must have been experimenting
you must have been experimenting
they must have been experimenting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not experiment
you must not experiment
he must not experiment
we must not experiment
you must not experiment
they must not experiment 	I must not be experimenting
you must not be experimenting
he must not be experimenting
we must not be experimenting
you must not be experimenting
they must not be experimenting	I must not have experimented
you must not have experimented
he must not have experimented
we must not have experimented
you must not have experimented
they must not have experimented	I must not have been experimenting
you must not have been experimenting
he must not have been experimenting
we must not have been experimenting
you must not have been experimenting
they must not have been experimenting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I experiment?
must you experiment?
must he experiment?
must we experiment?
must you experiment?
must they experiment? 	must I be experimenting?
must you be experimenting?
must he be experimenting?
must we be experimenting?
must you be experimenting?
must they be experimenting? 	must I have experimented?
must you have experimented?
must he have experimented?
must we have experimented?
must you have experimented?
must they have experimented? 	must I have been experimenting?
must you have been experimenting?
must he have been experimenting?
must we have been experimenting?
must you have been experimenting?
must they have been experimenting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not experiment?
must you not experiment?
must he not experiment?
must we not experiment?
must you not experiment?
must they not experiment? 	must I not be experimenting?
must you not be experimenting?
must he not be experimenting?
must we not be experimenting?
must you not be experimenting?
must they not be experimenting? 	must I not have experimented?
must you not have experimented?
must he not have experimented?
must we not have experimented?
must you not have experimented?
must they not have experimented? 	must I not have been experimenting?
must you not have been experimenting?
must he not have been experimenting?
must we not have been experimenting?
must you not have been experimenting?
must they not have been experimenting?