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八、The reason why + 句子 ~~~ is that + 句子 (...的原因是...) 例句：The reason why we have to grow trees is that they can provide us with fresh air./ The reason why we have to grow trees is that they can supply fresh air for us. 我们必须种树的原因是它们能供应我们新鲜的空气。 九、The + ~er + S + V, ~~~ the + ~er + S + V ~~~ The + more + Adj + S + V, ~~~ the + more + Adj + S + V ~~~(愈...愈...) 例句：The harder you work, the more progress you make. 你愈努力，你愈进步。 The more books we read, the more learned we become. 我们书读愈多，我们愈有学问。 十 、By +Ving, ~~ can ~~ (借着...，..能够..) 例句：By taking exercise, we can always stay healthy. 借着做运动，我们能够始终保持健康。 | 
