杭州交通信息网去农村发免费东西骗局:还是还是语言学问题~~~~
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请用短语结构语法（phrase structure grammar）写出下列句子的推导史（the history of derivation），并写出两个跟此结构相同的汉语句子。
The linguistics teacher set a hard problem to his students.
提示：有关PSG，可参阅Chomsky(1956, 1957）。推导史自句子S开始，一次改写（rewriting）一个符号。直至将所有的非终端符号改写成终端符号。
The linguistics teacher set a hard problem to his students.
提示：有关PSG，可参阅Chomsky(1956, 1957）。推导史自句子S开始，一次改写（rewriting）一个符号。直至将所有的非终端符号改写成终端符号。
The linguistics teacher set a hard problem to his students.
1.The teacher set a problem .
2.The teacher was a linguistics one.
3.The problem was a hard one.
4.The problem was to his students.
1.The teacher set a problem .
2.The teacher was a linguistics one.
3.The problem was a hard one.
4.The problem was to his students.