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 .