he is unhappy,because he lost his favouritehe is unhappy,because he lost his favourite toy.(改错)

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heisunhappy,becausehelosthisfavouriteheisunhappy,becausehelosthisfavouritetoy.(改错)heisunhappy,becaus

he is unhappy,because he lost his favouritehe is unhappy,because he lost his favourite toy.(改错)
he is unhappy,because he lost his favourite
he is unhappy,because he lost his favourite toy.(改错)

he is unhappy,because he lost his favouritehe is unhappy,because he lost his favourite toy.(改错)
is 改为 was