例句：It is universally acknowledged that trees are indispensable[不可或缺的] to us.
(全世界都知道树木对我们是不可或缺的。)
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.
(我们必须种树的原因是它们能给我们提供新鲜空气。)
be closely related to sth.：与……息息相关
例句：Taking exercise is closely related to health.
(做运动与健康息息相关。)
So + 形容词 + be + S + 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。)
It is time + S + 动词过去式：该是……的时候了。
例句：It is time the authorities concerned took proper steps to solve the traffic problems.
(有关当局是时候采取适当措施解决交通问题了。)
S + enable + O + to + V：……使……能够……
例句：Listening to music enables us to feel relaxed.
(听音乐使我们获得放松。)
be + forced / obliged / compelled + to + V：不得不……
例句：Since the examination is around the corner, I am compelled to give up doing sports.
(既然考试迫在眉睫，我不得不放弃做运动。)
a. + as + S + be, S + V + O：虽然……， 但是……
例句：Rich as our country is, the quality of our life is by no means satisfactory.
(虽然我们的国家富有，但我们的生活质量仍差强人意。)
It is conceivable / obvious / apparent that + 句子：可想而知/明显/显然……
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