While the cost of wireless service has plummeted in the last year and mobile phones are increasingly common, many people are now using their mobile phones to make calls across a wide region at night and on weekends, when numerous wireless companies provide unlimited airtime for a relatively small monthly fee.
语法 Sentence Correction-2230
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正确的用户笔记
missyun 2014-08-13 11:59:30
in the last year要与一般过去时搭配；while引导的从句要与主句发生在同一时间，可是wireless service has plummeted与主句不是同一时间发生的，用while错误。
Garfield11 2015-10-29 21:10:26
while引导的从句要和主句同时发生
fishanne 2016-01-16 18:02:24
while表转折或同时，逻辑语意不合适 and前后连接的两个时态不一致，“ has plummeted 和 are increasing "不平行
停不下来的雕兄 2016-12-26 19:49:57
choice (e) can be knocked out for its bad parallelism. the two actions described at the beginning - cost plummeting, phones becoming more common - are clearly simultaneous, so we need to use parallel structure for these simultaneous events. the first is "the cost ... has plummeted", so the second MUST be "phones ... have become increasingly common". it's not written that way, so (e) is incorrect. in addition, (e) uses while in a questionable sense. when while appears at the beginning of a clause like this, it's normally used to introduce contrast ("while most of the class spent the weekend studying for class, i spent the weekend at the beach").
安安1224 2016-11-05 13:28:28
while使用错误，这里不是表示当……时候
糯米团子QUQ 2016-11-02 10:48:24
while引导的从句要与主句发生在同一时间，可是wireless service has plummeted与主句不是同一时间发生的，用while错误。
yiyi11311 2016-10-17 23:11:59
while引导的从句要与主句发生在同一时间
桐桐不要大胖脸 2016-10-16 20:35:31
while放在句首一般都是表强转折或者是让步尽管，但是这个没有逻辑。 in the last year是过去式的标志词，不能使用现在完后时
糯米团子QUQ 2016-09-30 21:40:08
【此处注意点】要记得划线句子的大结构，是没有问题的！！！！！！
糯米团子QUQ 2016-09-30 21:35:31
划线部分大结构没有什么问题，但是last year不应该用has plummeted。
shisu0610041 2016-09-10 21:24:34
E 最大的问题是while表转折对比改变了原句的意思，而且while表转折会有同时的意思， while引导的表对比时间的两事件要同时发生，而这里has plummeted 和 are using mobile phones明显是前者先于后者，所以时态不对；
Mitchie 2016-07-25 10:59:18
（while可以表转折也可以表同时，但是这里转折逻辑不通，如果表同时，必须保证主句和while引导的从句同时发生，也不对） 但是in the last year 确实要用现在完成时，（in last year 用一般过去式）参考PREP08语法笔记
凡糕君 2016-07-16 11:23:15
in the last year要与一般过去时搭配；while引导的从句要与主句发生在同一时间，可是wireless service has plummeted与主句不是同一时间发生的，用while错误。
