Fill in the blank with the appropriate relative pronoun.Je ne sais pas arrive.

The correct sentence is “Je ne sais pas ce qui arrive” (“I don’t know what is happening”). Use “ce qui” when “what” is the subject of the following verb: here, “what” is what arrives or happens. “Ce que” is used when “what” is the object of a verb, and “ce qu’” is its form before a vowel sound.

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