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in the PONS Dictionary

concentrer [-e]

concentrer
concentrar
se concentrer
concentrarse (sur en)
Présent
jeconcentre
tuconcentres
il/elle/onconcentre
nousconcentrons
vousconcentrez
ils/ellesconcentrent
Imparfait
jeconcentrais
tuconcentrais
il/elle/onconcentrait
nousconcentrions
vousconcentriez
ils/ellesconcentraient
Passé simple
jeconcentrai
tuconcentras
il/elle/onconcentra
nousconcentrâmes
vousconcentrâtes
ils/ellesconcentrèrent
Futur simple
jeconcentrerai
tuconcentreras
il/elle/onconcentrera
nousconcentrerons
vousconcentrerez
ils/ellesconcentreront
See further verb tables