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、So + 形容词 + be + 主词 + that + 句子 (如此...以致于...)

例句：So precious is time that we can't afford to waste it.

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