ar 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。

　　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.

　　     时间是如此珍贵，我们经不起浪费它。

　　十、adj + as + subject（主词）+ be, s + v~~~ （虽然...）

　　例句：

　　    rich as our country is, the qualities of our living are by no means satisfactory. {by no  means = in no way = on no account 一点也不}

　　    虽然我们的国家富有，我们的生活品质绝

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