现在分词与连词
One refers to the type of listening practice which we do when learning a foreign language. 如何分析上句中的 when learning?
分词作状语时,只能根据逻辑关系而不能根据语法特征来判定它是时间状语、条件状语或让步状语等。因此,有时会遇到很难判定其归属的情形。如果在分词之前加上 when, while, since, if, once, though, unless 等连词,就会很清楚地表明状语的性质。上句中的 when learning ...一看便知是时间状语。对于这种结构也可以作另外的解释:when learning 是省略了主语和助动词的时间状语从句。when learning = when (we are) learning。
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While trying to open the can, I cut my hand. 在试图打开罐头时，我划破了手。
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Be careful when crossing the street. 过马路时要小心。
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If travelling north, you must change at Leeds. 如果到北方旅行,你必须在利兹换车。
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Though understanding no Spanish, she was able to communicate with the other students. [“Though she understood no Spanish, …”] 尽管她不懂西班牙语，但是她能跟其他学生交流。
[参见participle , once(conj.) , when ]
请做下面的英语试题：
- While ____ the newspaper, I heard somebody knocking at the door.
A. read B. reading C. to read D. was reading
- Don't touch anything unless ____.
A. ask to B. asking to C. asked to D. to ask
- Though ____ of the danger, he still went skating on the thin ice.
A. warning B. warned C. warn D. to warn