be
单词辨析：
除了用作连系动词外，还可表示某物存在或某事发生，常用于正式文体。
to be or not to be
生存还是毁灭
The great empire has ceased to be.
那个伟大的帝国已不复存在了。
Where is the wedding to be?
婚礼在何处举行？
指真实地发生或存在，也可指在困境中生活，不用进行时。
I believe that God exists.
我相信上帝存在。
Salt exists in many things.
许多东西中都含有盐分。
Fish cannot exist without water.
没有水，鱼就不能生存。
He exists on porridge.
他靠稀粥度日。
指生存、存活，或者强调以某种方式过活，可用进行时。
His grandmother lived until she was 105.
他的祖母活到105岁。
Since their marriage, the young couple has been living happily.
结婚之后，这对年轻的夫妻过着幸福的生活。
The local people there have lived through two world wars.
那里的当地居民经历过两次世界大战。
相关例句：
The cost of electricity from coal-fired stations is expected to fall
用煤作燃料的火力发电站的成本有望降低。
'Is he still just as fat?' — 'I wouldn't know,' continued her mother, ignoring the interruption, 'and be that as it may, he has made a fortune.'
“他还是那么胖吗？”——“我不知道，”她妈妈接着说，没有理睬这一打岔，“就算那样，他已经发财了。”
It hurt so badly he wished to cease to be.
他觉得疼痛难忍，恨不得死了算了。
She didn't always think carefully about what she was doing
她对自己在做的事情并不总是考虑得很清楚。
Then he received a phone call that was to change his life
然后，他接到一个将改变他一生的电话。
Who is to say which of them had more power?
谁来决定他们之中谁的权力应该更大一些？