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.計算機使人們彼此間能更方便地交流。
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.我剛要出去買東西，天就突然下雨了。
3、by accident/by chance/accidentally 偶然地
4、come across sb 偶然遇見
5、act on sth 依……行事
eg：Each student should act on the rules and regulations of the school.每個學(xué)生都應(yīng)該遵守學(xué)校的規(guī)章制度。
6、add to/add up to 加上/總計達(dá)
eg：The number of the patients added up to three hundred last week.上星期，病人人數(shù)達(dá)到了三百人。
7、in advance/ahead of time 提前
8、after all 畢竟
9、agree to do sth/agree with sb 同意做某事/同意某人