Do和does的区别和用法区别是：do 是动词原形，用于第一人称、第三人称的复数 (i/you/we/they)。does 用于第三人称单数 (he/she/it) does 用于第三人称单数。do用于一般现在时且主语是复数we,they, The sports injury treatment service operates on a paying basis, as does the nutritional service. Is 是连系动词，在语法功能上和连词相当，起着联系前后单词的作用，比如 他18岁 he+is +18 她很漂亮 she is beautiful。 is 通常跟在主语后 ，is后面跟名词性成分或者形容词或者动词ing（表示现在进行）.
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