must attempt
Verbo regular: attempt - attempted- attempted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must attempt
you must attempt
he must attempt
we must attempt
you must attempt
they must attempt 	I must be attempting
you must be attempting
he must be attempting
we must be attempting
you must be attempting
they must be attempting	I must have attempted
you must have attempted
he must have attempted
we must have attempted
you must have attempted
they must have attempted	I must have been attempting
you must have been attempting
he must have been attempting
we must have been attempting
you must have been attempting
they must have been attempting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not attempt
you must not attempt
he must not attempt
we must not attempt
you must not attempt
they must not attempt 	I must not be attempting
you must not be attempting
he must not be attempting
we must not be attempting
you must not be attempting
they must not be attempting	I must not have attempted
you must not have attempted
he must not have attempted
we must not have attempted
you must not have attempted
they must not have attempted	I must not have been attempting
you must not have been attempting
he must not have been attempting
we must not have been attempting
you must not have been attempting
they must not have been attempting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I attempt?
must you attempt?
must he attempt?
must we attempt?
must you attempt?
must they attempt? 	must I be attempting?
must you be attempting?
must he be attempting?
must we be attempting?
must you be attempting?
must they be attempting? 	must I have attempted?
must you have attempted?
must he have attempted?
must we have attempted?
must you have attempted?
must they have attempted? 	must I have been attempting?
must you have been attempting?
must he have been attempting?
must we have been attempting?
must you have been attempting?
must they have been attempting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not attempt?
must you not attempt?
must he not attempt?
must we not attempt?
must you not attempt?
must they not attempt? 	must I not be attempting?
must you not be attempting?
must he not be attempting?
must we not be attempting?
must you not be attempting?
must they not be attempting? 	must I not have attempted?
must you not have attempted?
must he not have attempted?
must we not have attempted?
must you not have attempted?
must they not have attempted? 	must I not have been attempting?
must you not have been attempting?
must he not have been attempting?
must we not have been attempting?
must you not have been attempting?
must they not have been attempting?