He was somewhat uncertain about how to use the new machine a

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He was somewhat uncertain about how to use the new machine and (asked for) more specific instructions be sent
这里asked for 被划线,
请问它错哪了呢?

1.如果 be sent 未打底线,asked for 应改为asked.
...asked (that) more specific instructions be sent.
说明：ask 的宾语从句用原形式虚拟语气.
如：He asked (that) the trees be cut down.(= He asked (that) the trees should be cut down.)
要这样用(能这样用)的动词还有：require,request,demand,suggest,propose,command,order,desire,insist,decide,urge,recommend等.
2.如果 asked for 没错,那 be sent 就错.得将它改为 to be sent.
如：He asked for the trees to be cut down.(语法对,大概实际上这样说的人不会很多.)
3.demanded 用在此句中虽语法正确,但用词不当!wrong choice of word.
...and demanded (that) more specific instructions be sent (与asked 一样,属虚拟语气,但口气不妥.)

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