hardly...when常在一起连用，表示“一...就...”。当hardly在句首时，为固定的倒装句。基本句型为：主语+had hardly done...when+主语+did...。
hardly...when例句
1.Hardly had he seen me when he ran away.
他一看见我就跑了。
2.Hardly had the game begun when it started raining.
比赛刚刚开始就下起雨来。
3.She had hardly had time to sit and have a rest when the phone rang again.
她刚想坐下来休息一会儿，电话又响了。