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in the PONS Dictionary

I. alterner [altɛʀne] VB intr

II. alterner [altɛʀne] VB trans AGR

alterner la betterave et le blé
alterner les cultures
Présent
j'alterne
tualternes
il/elle/onalterne
nousalternons
vousalternez
ils/ellesalternent
Imparfait
j'alternais
tualternais
il/elle/onalternait
nousalternions
vousalterniez
ils/ellesalternaient
Passé simple
j'alternai
tualternas
il/elle/onalterna
nousalternâmes
vousalternâtes
ils/ellesalternèrent
Futur simple
j'alternerai
tualterneras
il/elle/onalternera
nousalternerons
vousalternerez
ils/ellesalterneront