1. enable sb to do sth使某人能做某事

　　eg. The computer enables people to communicate with each other more conveniently. /计算机使人们彼此间能更方便地交流。

　　2. be about to do sth… when 正要做某事……突然……

　　eg. I was about to go shopping when it suddenly began to rain. /我刚要出去买东西，天就突然下雨了。

　　3. by accident / by chance / accidentally 偶然地

　　4. come across sb 偶然遇见

　　5. act on sth 依……行事

　　eg. Each student should act on the rules and regulations of the school. / 每个学生都应该遵守学校的规章制度。

　　6. add to / add up to 加上/ 总计达

　　eg. The number of the patients added up to three hundred last week. / 上星期，病人人数达到了三百人。

　　7. in advance / ahead of time 提前

　　8. after all 毕竟

　　9. agree to do sth / agree with sb/ agree to sth

　　10. aim at doing sth 下定目标做某事

　　eg. Aiming at winning the game， he practiced hard every day. / 为赢得比赛，他每天努力练习。

　　11. allow / permit / forbid doing sth 允许/ 允许/ 禁止做某事

　　12. allow / permit/ forbid sb to do sth 允许/ 允许/ 禁止某人做某事

　　13. apologize to sb for sth 因某事向某人道歉

　　14. take sth in one

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