must tumble
Verbo regular: tumble - tumbled- tumbled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must tumble
you must tumble
he must tumble
we must tumble
you must tumble
they must tumble 	I must be tumbling
you must be tumbling
he must be tumbling
we must be tumbling
you must be tumbling
they must be tumbling	I must have tumbled
you must have tumbled
he must have tumbled
we must have tumbled
you must have tumbled
they must have tumbled	I must have been tumbling
you must have been tumbling
he must have been tumbling
we must have been tumbling
you must have been tumbling
they must have been tumbling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not tumble
you must not tumble
he must not tumble
we must not tumble
you must not tumble
they must not tumble 	I must not be tumbling
you must not be tumbling
he must not be tumbling
we must not be tumbling
you must not be tumbling
they must not be tumbling	I must not have tumbled
you must not have tumbled
he must not have tumbled
we must not have tumbled
you must not have tumbled
they must not have tumbled	I must not have been tumbling
you must not have been tumbling
he must not have been tumbling
we must not have been tumbling
you must not have been tumbling
they must not have been tumbling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I tumble?
must you tumble?
must he tumble?
must we tumble?
must you tumble?
must they tumble? 	must I be tumbling?
must you be tumbling?
must he be tumbling?
must we be tumbling?
must you be tumbling?
must they be tumbling? 	must I have tumbled?
must you have tumbled?
must he have tumbled?
must we have tumbled?
must you have tumbled?
must they have tumbled? 	must I have been tumbling?
must you have been tumbling?
must he have been tumbling?
must we have been tumbling?
must you have been tumbling?
must they have been tumbling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not tumble?
must you not tumble?
must he not tumble?
must we not tumble?
must you not tumble?
must they not tumble? 	must I not be tumbling?
must you not be tumbling?
must he not be tumbling?
must we not be tumbling?
must you not be tumbling?
must they not be tumbling? 	must I not have tumbled?
must you not have tumbled?
must he not have tumbled?
must we not have tumbled?
must you not have tumbled?
must they not have tumbled? 	must I not have been tumbling?
must you not have been tumbling?
must he not have been tumbling?
must we not have been tumbling?
must you not have been tumbling?
must they not have been tumbling?