The soldier was too weak to be sent to the front.
那士兵身体太弱，不能送往前线。
We demanded that they (should) be sent to the front immediately.
我们要求把他们立刻派往前线。
It was ordered that all the soldiers should be sent to the front.
命令要求所有的士兵都应当被送到前线去。
It was ordered that all the soldiers should be sent to the front.
命令要求所有的士兵都应当被送到前线去。
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