话题 when as while

话题 while，as，when

话题 and only when

话题 such as when

话题 when doing sth

话题 when being interviewed

话题 选用since还是when

话题 怎样分析as when

话题 when in walks

话题 it was...when...

问题 国际贸易增长2.4%（用介词in还是for）

2.4% growth in global trade这个句子里的介词用 for 可以吗？

问题 after done 还是 after being done

...么答案是being done而不是done？不是说after，before之类的词只能加doing或done吗？

问题 句子分析

...various news sources, but people rarely act in a rational way as predicted when handling with those sources.请问这句话act as是作充当，担任的意思吗，但是后面又跟了个动词。如果以as开始作为一个新句子来看的话，好像也没法翻译。

问题 official的理解与翻译

...ramme, has welcomed the arrival of a rare black rhino calf (犀牛幼崽). When the tiny creature arrived on January 31, she became the 40th black rhino to be born at the reserve. And officials at Port Lympne were delighted with the new arrival, especially as black rhinos are known for being difficu...

问题 recently连用的过去完成时

...持续到了现在，但这句怎么用了过去完成时态？我并没有从句意中找begun发生在recently之前或在那个过去动作之前，这里为什么用了过去完成时had begun ?