John looked for his sister.He saw a car accident happen.(用while连成一句)

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Johnlookedforhissister.Hesawacaraccidenthappen.(用while连成一句)Johnlookedforhissister.Hesawacaraccidenth

John looked for his sister.He saw a car accident happen.(用while连成一句)
John looked for his sister.He saw a car accident happen.(用while连成一句)

John looked for his sister.He saw a car accident happen.(用while连成一句)
While John looked for his sister,he saw a car accident happen.

John saw a car accident happen while looking for his sister.