knowing what part of speech a word is helps me to understand better为什么用helps有is为什么用helps

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knowing what part of speech a word is helps me to understand better为什么用helps有is为什么用helps

knowing what part of speech a word is helps me to understand better为什么用helps有is为什么用helps
knowing what part of speech a word is helps me to understand better为什么用helps
有is为什么用helps

knowing what part of speech a word is helps me to understand better为什么用helps有is为什么用helps
knowing what part of speech a word is 是做主语的动名词短语,动名词做主语时,谓语用单数
is 是what part of speech a word is 这个knowing 的宾语从句,从属于动名词短语---主语部分.不是主句中的谓语