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teacher's pay remained the biggest cost,reaching 50%of total

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teacher's pay remained the biggest cost,reaching 50%of total spending in 1991 and ending at 45% in
2001.
其中的reaching和ending 用的是什么语法啊,为什么加动词的ing形式,谁能仔细讲解一下啊?
teacher's pay remained the biggest cost,reaching 50%of total
用的语法是伴随状语,动词+ing以动名词的形式作伴随状语修饰主语,在这句话中reaching 50% of total spending的意思teacher‘s pay达到了50% of total spending,ending at 45%的意思是teacher's pay 终止在了45%.
其实这句话完全可以拆成两句话,即Teacher's pay remained the biggest cost.It reached 50%of total spending in 1991 and ended at 45% in...虽然意思是一样的,但是拆成两句话显得很罗嗦,不地道.伴随状语的使用可以使得句子更简练,是比较地道的书面表达.
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