查看：2012年12月英语六级考试写作加分句汇总
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.
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 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。
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，我们经不起浪费它。