appeared on the river bank. He wanted to cross the river.那是一个漆黑的夜晚，风刮得很厉害，雨下得很大，一个解放军战士突然出现在河岸上，他想过河去。

　　4. when作并列连词，表示“(这时)突然”之意时，第一个并列分句用过去进行时，when引导的并列分句用一般过去时。如：

　　I was taking a walk when I met him. 我正在散步，突然遇见了他。

　　We were playing outside when it began to rain. 我们正在外边玩，这时下起雨来了。

　　5. go, come, leave, start, arrive等动词可用过去进行时表示过去将来的含义。如：

　　I was leaving for Wuhan that day. 那天我正要去武汉。

　　She was coming later. 她随后就来。

　　三、过去进行时表示婉转语气(只限于want, hope, wonder 等动词)，用以提出请求。如：

　　I was wondering if you could help me.

　　I was hoping you could send me home.

　　过去进行时专项练习

　　一、单项选择

　　1.My brother ___ while he ___ his bicycle and hurt himself.

　　A. fell, was riding B. fell, were riding

　　C. had fallen, rode D. had fallen, was riding

　　2. Tom ___ into the house when no one ___.

　　A. slipped, was looking B. had slipped, looked

　　C. slipped, had looked D. was slipping, looked

　　3.The last time I __ Jane she ___ cotton in the fields.

　　A. had seen, was picking B. saw, picked

　　C. had seen, picked D. saw, was picking

　　4.I don ' t think Jim saw me; he ___ into space.

　　A. just stared B. was just staring

　　C. has just stared D. had just stared