1主语+was/were doing when... 2主语+was/were about to do when... 3主语+had/hadn't done for some time
意思如下:
1、主语+was/were doing when...
(过去)......发生时主语正在做某事
I was doing my homework when she walked in.她进来的时候我正在做作业。
2、主语+was/were about to do when...
(过去)......发生时主语将要做某事
I was about to do my homework when she walked in.她进来的时候我正要做作业。
3、主语+had/hadn't done for some time
(迄今)......主语做/没有做某事已经有一段时间了
I had/hadn't played computer games for three months.我玩/不玩电脑游戏已经三个月了。
时态
在语法里,时或时态表示行为发生的时间和说话时的关系。一般分为过去式、现在式、将来式,通常也有与表示动作进行或终止的进行式和完成式等体貌一起相连用的情况。
时态连同语气、语态、体貌和人称为动词形式至少可能能够表现出的5种语法特性。
有些语言,没有时态的使用,如分析语的中文,但必要时,仍有时间副词的辅助。也有些语言,如日文,形容词的词形变化能表达出时间上的资讯,有着类似动词的时态性质。还有些语言,如俄文,一个单词就能表现出时态和体貌。
(过去) ......发生时 主语 正在做某事
I was doing my homework when she walked in. 她进来的时候我正在做作业。
2. 主语+was/were about to do when...
(过去)......发生时 主语 将要做某事
I was about to do my homework when she walked in. 她进来的时候我正要做作业。
3. 主语+had/hadn't done for some time
(迄今)......主语 做/没有做 某事 已经有一段时间了
I had/hadn't played computer games for three months. 我玩/不玩电脑游戏已经三个月了。
主语+was/were about to do when... (过去)正要去做某事突然 i was about to water my garden when the phone rang.
主语+had/hadn't done for some time 好一段时间没有做某事 i had not contacted her for ages .