Exercise 4.48 · 习题

Exercise 4.48: Extend the grammar given above to

handle more complex sentences. For example, you could extend noun phrases and

verb phrases to include adjectives and adverbs, or you could handle compound

sentences.

练习 4.48：扩展上面给出的语法，使其能处理更复杂的句子。例如，可以扩展名词短语和动词短语以包含形容词和副词，或者处理复合句。