Conjugación del verbo inglés
CAN CONCENTRATE

Verbo regular: concentrate - concentrated - concentrated

Afirmación

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

Negación

Forma simple	Forma con V-ing
I cannot concentrate you cannot concentrate she cannot concentrate we cannot concentrate you cannot concentrate they cannot concentrate	I cannot be concentrating you cannot be concentrating she cannot be concentrating we cannot be concentrating you cannot be concentrating they cannot be concentrating
Perfecto	Perfecto con V-ing
I cannot have concentrated you cannot have concentrated she cannot have concentrated we cannot have concentrated you cannot have concentrated they cannot have concentrated	I cannot have been concentrating you cannot have been concentrating she cannot have been concentrating we cannot have been concentrating you cannot have been concentrating they cannot have been concentrating

Forma interrogativa

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

Forma interro-negativa

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