求英语短句改错（需要改错说明）

求英语短句改错（需要改错说明）
英语短句改错、但需要改错的原因、为什么这样改?　　　　　　　　　　　　　　　　　　　　　　　　　　　1.Don't let the children who are so young to go swimming 　　　　　　　　　2.It took place in France,an european country 　　　　　　　　　　　　3.Would you bought the dictionary if you had more money yesterday ? 　　　　　　　　4.I shall lend the money to who comes first . 　　　　　　　 5.That is known to all ,Taiwan belongs to China .　　　　　　　　　全部是手机打的不容易、希望尽快回答……

1.Don't let the children who are so young go swimming let后加原形 所以去掉to　　　　　　　　　2.It took place in France,a european country 　european 是辅音音标开头的不用加an　　　　　3.Would youhave bought the dictionary if you had more money yesterday 若与过去事实相反,条件从句的谓语用过去完成时(had+过去分词),主句谓语用“should (would,could,might)+have+过去分词”：
　4.I shall lend the money to the one who comes first .
5.it is know that Taiwan belongs to China .
再问： 第四第五、为什么这样改
再答： .I shall lend the money to the one who comes first . 此句缺先行词 5 it is known to all that Taiwan belongs to China it 是形式主语 that 是主语从句