七、An advantage of ~~~ is that + 句子

　　例句：An advantage of using the solar energy is that it wont create any pollution.

　　用太陽(yáng)能的優(yōu)點(diǎn)是它不會(huì)制造任何污染。

　　八、The reason why + 句子 ~~~ is that + 句子

　　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.

　　我們必須種樹(shù)的原因是它們能供應(yīng)我們新鮮的空氣。

　　九、So + 形容詞 + be + 主詞 + that + 句子

　　例句：So precious is time that we cant afford to waste it.

　　時(shí)間是如此珍貴，我們經(jīng)不起浪費(fèi)它。