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SAT语法06真题arowofginkgotrees为什么将are改为isExtendingalongseveralcityblocksarearowofginkgotrees,theirleavesturningabrilliantyellownowthatsummerisover.为什么这里要将are改为is?arowofginkgotrees

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SAT 语法06真题 a row of ginkgo trees 为什么将are 改为 is
Extending along several city blocks are a row of ginkgo trees,their leaves turning a brilliant yellow now that summer is over.为什么这里要将are 改为is?a row of ginkgo trees 和 a group of people,a pair of shoes 的异同点究竟在哪里?求指教感激不尽!
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答案和解析
当主语被a row of...修饰,表示单数概念 , 谓语用单数.
这 个句子是个倒装句A row of ginkgo trees is extending along several city.一行银杏树在几座城市扩展开来所以后面的非限定的定语从句修饰trees
a group of 后面只能接可数名词
a pair of 意为一双,一对.a pair of 虽然后接可数名词复数,但如果a pair of短语作主语时,句子的谓语动词一般用单数形式;如果是two/three/a pair of短语作主语,句子的谓语动词用复数形式;即与pair的数保持一致.
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