什么是第三人称单数形式、现在分词、过去式

visit, read , fiy , study , get , open , swim , see , write , run 这些单词怎样写

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单三
visits, reads , 【fiy(这个不嫌扮御知道……)】 , studies , gets , opens , swims , sees , writes , runs

现缺运在分词
visiting, reading , 【fiy（仍不知道……）】 , studying , geting , opening , swimming , seeing , writing , running

过去式
visited, read , 【fiy(呃……这个词%…偶不芹岩认得) 】, studied , got , opened , swimmed , saw , wrote , ran

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