Thepolulation是主语oftheU.S.是定语is是系动词309million是表语,makingitthecountrywiththelargestnumberofnativeEnglishspeakers.是现在分词短语作伴随状语其中making是现在分词it是现在分词的...
原句=ThepolulationoftheU.S.is309million,andthepolulationmakestheU.S.thecountrywiththelargestnumberofnativeEnglishspeakers.
当然说成非限制性定语也能说通
原句=ThepolulationoftheU.S.is309million,whichmakestheU.S.thecountrywiththelargestnumberofnativeEnglishspeakers.
句子意思美国人口是3.09亿,使美国成为拥有最多英语为母语的人的国家.