句子:1. It is necessary. 很有必要。2. Jane is something of an authority on the subject. 简在这方面算得上是权威。3. It is raining. 下雨了。4. We're elected. 我们被选中了。5. It's about time you were independent of your parents. 你该独立,不再依靠父母了。6. This room is for rent. 这个房间出租。7. Stop grumbling. 停止抱怨。8. The company has branches in all large cities. 这家公司在所有大城市都有分部。9. I've had coffee already. 我已经喝过咖啡了。10. We need to take care of this immediately. 我们得马上处理这件事。别忘了