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cest是一个法语缩写，表示“是”。它通常用于描述一个事物的状态或属性。例如，当说“cest un bel automne”时，意思是“这是一个美丽的秋天”。
1. It is/were
2. It has/had/will have been
3. It is about/to be
4. It is possible/probable/likely that
5. It is necessary/important/desirable that
6. It is essential/crucial/critical that
7. It is time that
8. It is said that
9. It is recommended that
10. It is worthwhile that
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