新概念英语第一册：117-118课语法及单词解析。
篇一】语法grammar in use过去实行时。
构成：be的过去式+现在分词。
过去实行时表示过去某时正在实行的情况或动作。过去实行时和一般过去时经常在同一个句子里使用。过去实行时表示过去正在实行的情况或动作，一般过去时则表示比较短暂的动作或事件。
过去实行时的时间状语从句一般由when，while及(just)as等来引导，说明主句中动作发生时的背景。此外，可用while或at the time等强调同时实行的两种或几种动作。请看例句：
when i was doing the housework, my husband telephoned mefrom the office.
当我正在干家务时，我丈夫从办公室打**给我。
while i was listening to the stereo, my mother came intothe room.
我正在听立体声节目时，我母亲进房间了。
just as she was cleaning her shoes, george knocked at thedoor.
她正在擦鞋时，乔治敲门了。
while i was cooking the dinner ,he was working in thegarden.
我做饭时，他正在花园里劳作。
篇二】词汇学习word studyswallow v.(1)吞下，咽下：
tommy had swallowed the coins.汤米把硬币吞下去了。(2)抑制，使不流露：
i tried hard to swallow my doubts.我强忍着不露出怀疑的神色。
she swallowed a smile and sat there still.她忍住没笑，静静地坐在那里。(3)吞并；侵吞：
our company was swallowed up by an american company lastyear.
我们公司去年被一家美国公司吞并了。
nazi germany nearly swallowed up the whole europe inworld war ⅱ.
第二次世界大战中，纳粹德国几乎吞并了整个欧洲。【篇三】ring v.
1)鸣响；发出清脆的响声：
when i was opening the front door, the telephone rang.
我正开前门时，**铃响了。
yesterday morning, my alarm clock didnt ring at 7 oclockas usual.
昨天早上，我的闹钟没像往常那样在7点钟闹。(2)打**；按铃：
you said you were going to ring me last night, but youdidnt.
你说过你昨晚会给我打**的，不过你并没有打。somebody is ringing the doorbell.有人在按门铃。
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