第6课

关于逗号的一些知识

原则：逗号没有能力连接两个单独的句子。

如何区分短语与句子？一个结构如果有完整的谓语部分就是句子。

何为完整的谓语部分？如果能判断出一个结构的时态就可以称这个结构为完整的谓语部分。

在什么样的情况下一个逗号可以将句子分成两部分，而这两部分都有完整的谓语呢？

1 两个句子中间有连接词连接；

2 这两个句子是主从句关系（主从句之间一定要有句子引导词来引导）。

10. Walter offered us a lift when he was leaving the office, but our work _A_, we declined the offer. [declined v. 婉言谢绝]

A not being finished   B not having finished

C had not been finished   D was not finished

42. A survey was carrie3d out on the death rate of new-born babies in that region, _D_ were surprising. [survey 调查]

A as results   B which results   C the results of it   D the results of which

51. All flights _D_ because of the snowstorm, many passengers could no nothing but take the train. [having been canceled这里是独立主格作原因状语]

A had been canceled   B have been canceled

C were canceled   D having been canceled

-------------------------1999-01-------------------------

46. _A_ the calculation is right scientists can never be sure that they have included all variables and modeled them accurately. [variable n. 变项，变量；model vt. 建模]

A Even if   B As far as   C If only   D So long as

even if 即使，即便； so long as （后面加句子时）只要。

47. My train arrives in New York at eight o'clock tonight. The plane I would like to take from there _B_ by then.

A would leave   B will have left   C has left   D had left

将来完成时：will have + 动词过去分词。

49. Harry was _A_ by a bee when he was collecting the honey.

A stung   B stuck   C bitten   D scratched

sting v. （蜜蜂）叮，蛰； bite v. （蚊子等）咬； scratch vt. 抓伤，划破（通常指猫抓人）。

once bitten, twice shy. 一朝被蛇咬，十年怕井绳。

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