1、enable sb to do sth 使或人能做某事

eg：The computer enables people to communicate with each other more conveniently.计算机使大家彼此间能更便捷地交流。

2、be about to do sth… when 正要做某事……俄然……

eg：I was about to go shopping when it suddenly began to rain.我刚要出去购物，天就俄然下雨了。

3、by accident/by chance/accidentally 偶尔地

4、come across sb 偶尔遇到

5、act on sth 依……行事

eg：Each student should act on the rules regulations of the school.每一个学生都要恪守校园的规章规范。

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 提早

8、after all 到底

9、agree to do sth/agree with sb 同意做某事/同意或人