英语主语变被动语（在线等）

You must hand in the test papers before the bell
rings
要两种

The test papers must be handed in before the bell.

The test papers must be handed in before the bell rings.

You are required to hand in the test papers before the bell. The test papers must be handed in before the bell.

The test papers must be hand in before the bell rings by you

The test papers must be handed in before the bell rings. The test papers must be handed by you in before the bell rings.

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