1、An advantage of is that + 句子(……的优点是……)
例句：An advantage of using the solar energy is that it won't create (produce) any pollution.
使用太阳能的优点是它不会制造任何污染。
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.
我们必须种树的原因是它们能供应我们新鲜的空气。
3、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.
时间是如此珍贵，它经不起我们浪费。