欢迎来下载注册会员。高考英语：

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