请用短语结构语法（phrasestructuregrammar）写出下列句子的推导史（thehistoryofderivation）,并写出两个跟此结构相同的汉语句子.Thelinguisticsteachersetahardproblemtohisstudents.提示：有关PSG,可参

Question

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.

Answer 1

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.