Conjugación del verbo inglés
MUST CONCENTRATE

Verbo regular: concentrate - concentrated - concentrated

Afirmación

Forma simple	Forma con V-ing
I must concentrate you must concentrate he must concentrate we must concentrate you must concentrate they must concentrate	I must be concentrating you must be concentrating he must be concentrating we must be concentrating you must be concentrating they must be concentrating
Perfecto	Perfecto con V-ing
I must have concentrated you must have concentrated he must have concentrated we must have concentrated you must have concentrated they must have concentrated	I must have been concentrating you must have been concentrating he must have been concentrating we must have been concentrating you must have been concentrating they must have been concentrating

Negación

Forma simple	Forma con V-ing
I must not concentrate you must not concentrate he must not concentrate we must not concentrate you must not concentrate they must not concentrate	I must not be concentrating you must not be concentrating he must not be concentrating we must not be concentrating you must not be concentrating they must not be concentrating
Perfecto	Perfecto con V-ing
I must not have concentrated you must not have concentrated he must not have concentrated we must not have concentrated you must not have concentrated they must not have concentrated	I must not have been concentrating you must not have been concentrating he must not have been concentrating we must not have been concentrating you must not have been concentrating they must not have been concentrating

Forma interrogativa

Forma simple	Forma con V-ing
must I concentrate? must you concentrate? must he concentrate? must we concentrate? must you concentrate? must they concentrate?	must I be concentrating? must you be concentrating? must he be concentrating? must we be concentrating? must you be concentrating? must they be concentrating?
Perfecto	Perfecto con V-ing
must I have concentrated? must you have concentrated? must he have concentrated? must we have concentrated? must you have concentrated? must they have concentrated?	must I have been concentrating? must you have been concentrating? must he have been concentrating? must we have been concentrating? must you have been concentrating? must they have been concentrating?

Forma interro-negativa

Forma simple	Forma con V-ing
must I not concentrate? must you not concentrate? must he not concentrate? must we not concentrate? must you not concentrate? must they not concentrate?	must I not be concentrating? must you not be concentrating? must he not be concentrating? must we not be concentrating? must you not be concentrating? must they not be concentrating?
Perfecto	Perfecto con V-ing
must I not have concentrated? must you not have concentrated? must he not have concentrated? must we not have concentrated? must you not have concentrated? must they not have concentrated?	must I not have been concentrating? must you not have been concentrating? must he not have been concentrating? must we not have been concentrating? must you not have been concentrating? must they not have been concentrating?