六、There is no doubt that + 句子~~ (毫无疑问的...)
例句：There is no doubt that our educational system leaves something to be desired.
毫无疑问的我们的教育制度令人不满意。
七、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。
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。
