1、An advantage of is that + 句子(……的優點是……)
例句：An advantage of using the solar energy is that it won't create (produce) any pollution.
使用太陽能的優點是它不會製造任何污染。
2、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 provideus with fresh air.
我們必須種樹的原因是它們能供應我們新鮮的空氣。
3、So + 形容詞 + be + 主詞 + that + 句子(如此……以致於……)
例句：So precious is time that we can't afford to waste it.
時間是如此珍貴，它經不起我們浪費。
