定语从句和非谓语作文好句【一】
一般说来，用on和at表示“as soon as, once”。on后面常接“来、去”之类的词，at后面常接“听到、看到”之类的词。in后面接其他带动作的词，相对于从属连词“while”。
例1：On removing them he was stunned to see that the plates were fogged where the crystals had covered them.当他把晶体揭开时，发现盘子上方雾蒙蒙，他吃了一惊。
例2：In running down the stairs, I heard the clock struck twelve.
我在跑下楼的时候，听见钟敲了十二下。
例3：He jumped with joy at hearing the news.他一听到这个消息就高兴得跳了起来。
定语从句和非谓语作文好句【二】
如果定语从句的时态与主句的时态具有同时性(包括谓语有情态动词或之后性，则可以用“关系代词或关系副词+不定式”来简化，或直接用“不定式”来修饰先行词。要注意的是，此时的不定式一定要是及物动词，如果是不及物，则需要在动词后面加上相应的介词，使之成为及物动词短语。这个结尾的介词可以提前到关系代词前面，也可以继续留在句尾。前者是正式说法，后者是非正式说法。
例1：We moved to the country so that the children would have a garden in which they could play in.
我们搬到了乡下，好让孩子们有个花园在里面玩。
改为：We moved to the country so that the children would have a garden in which to play.
或者：We moved to the country so that the children would have a garden to play in.
例2：He felt miserable unless he had neighbors (whomhe could quarrel with.
他要是没有可以吵架的邻居就难受。
改为：He felt miserable unless he had neighbors with whom to quarrel.
或者：He felt miserable unless he had neighbors to quarrel with.
例3： The conference which will be held this afternoon is bound to be a great success. 计划在今天下午举行的会议一定会取得成功。
改为：The conference which to be held this afternoon is bound to be a great success.
或者：The conference to be held this afternoon is bound to be a great success.
例4：At a ceremony in Honolulu on Dec. 29, Postmaster General John E. Potter gave a preview of the Lunar New Year Commemorative Stamps Souvenir Sheet, the grand finale of the Lunar Year stamp series, which will be available in 2005.
12月29日，美国邮政总局局长约翰·E·波特在檀香山从句了农历新年的纪念邮票小型张的揭幕仪式，这枚小型张将于2005年正式发行，它为农历新年的系列纪念邮票写下了完美的结局。(注意：与定语从句一样，也可以采用非限制性形式
改为：At a ceremony in Honolulu on Dec. 29, Postmaster General John E. Potter gave a preview of the Lunar New Year Commemorative Stamps Souvenir Sheet, the grand finale of the Lunar Year stamp series, to be available in 2005.
定语从句和非谓语作文好句【三】
当which引导的定语从句指代主句全部内容时，可以把which改为it，作形式主语，把原来的主句改成正在主语。或者把定语从句的整个信息改换为名词短语作主语，使原来的定语从句变成简单句。
例4： He indulges himself all day in computer games, which makes his parents extremely sad.
改为：It makes his parents extremely sad that he indulges himself all day in computer games.
他整天沉湎于电脑游戏，这使他父母伤心至极。(主语从句
或者：His indulgence in computer games all day makes his parents extremely sad. (名词短语
定语从句和非谓语作文好句【四】
同上面一样，At基本上后接sound，sight“听到、看到”之类的词；on接“回来、到达”之类的词；用in，during表示“when, while”；用over表示“while”之意。当然，这一切都是相对的分类。
例1：The little girl passed out at sight of a snake.小女孩一看到蛇就昏过去了。
例2：In our hurry to get from one place to another, we failed to see anything on the way.当我们急急忙忙从这儿到那儿的时候，一路上什么也没有看见。
例3：On arrival at the railway station, he found the train had already left.当他到达火车站的时候，他发现火车已经开走了。
例4：He had intended to go, but on second thoughts, he gave up the idea.
他本来想去，但进一步考虑后,打消了这个念头。
例5：During my absence, would you please take care of my cat?
在我不在的时候，请帮我照看一下猫，好吗？
例6：He fell asleep over a book.他看书的时候睡着了。
例7：After reelection he announces that he will not help.经过一番考虑后，他宣布将不提供任何帮助。
例8：After graduation, he went to America for his PhD studies.毕业之后，他去了美国攻读博士。
