the 序数词 to have done

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the 序数词 to have done
如果是强调第一个已经完成了什么事的,可不可以用the first to have done

可以,
the first to have done sth
没有错,
first 接后的名词（比如 one）一般可以省略,比如
He is the first to have tried this experiment.
句子相等于
He is the first person to have tried this experiment.
再问：还有一个就是i believed that perfect makes… 这里不是有个宾语从句吗？从句里的主语需不需要用非谓语动词形式
再答： i believed that perfect makes ... 仅从这几个单词看我无法判定句子是否正确，你有整个句子吗？
再问：是个完成句子，that后面一条横线，上面填熟能生巧好像是，
再答：熟能生巧的英语是 practice makes perfect 这是成语完整的句子是 I believe that practice makes perfect. practice 放前，perfect 放后。
再问：对就是这个practice需要用非谓语动词形式么，这不是做主语吗
再答：这是成语(idiomatic expressions) ，成语很常源自民间俗语，不一定要遵守语法。比如 come hell or high water raining cats and dogs eat your heart out 等等。看似语法有错，但人家是这样说的，这和汉语成语有时与逻辑/语法相违没两样。

the 序数词 to have done have done/to be done you have done mistake,you have to solve the mistake have done to to have done meant to have done done,tobe done,to have been done,to have done,having done,ha what they have done __useful to the people Have you done ____ to improve the environment? You have done something useful to i( ) the environment we have done enough to finish the work on time have been done 和 to be done