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3. a and b + 复数动词,即无论a,b是cn 还是un. t107
4. there be 句型中,单复数应有后面的句子主语来决定.
5. 一本书应用单数t174
6. 在以下结构中注意数的一致, 名词a+ be 动词/act as/…+ 另一名词b, 应该保证a与b在单复数上一致. 如t1, t3. men and women… when a child (有a child与men and women不一致); some bat caves have residents that take on different duties such as defending…, acting as sentinels…(这里residents与sentinels一致)
7. 考虑主谓一致的时候,不仅要注意主语的单复数,同时也要注意指代主语的代词的单复数,以此来排除一些选项,t265d
8. 注意复数对应复数t61,t97,t122. eg. iguanas are still prized as game animals
平行结构
1. 在以下平行结构中,“adj+名词1 and/or +名词2”以及“动词1 and/or 动词2+名词”,应分别考虑能否搭配的问题 t107
2. 注意大平行中有小平行,而且平行结构最后一个item之前要有and 连接t233
3. 搞清楚谁与谁平行t135,t160:
to help preserve ancient egyptian monuments threatened by high water tables,a swedish engineering firm has proposed installing pumps,perhaps solar powered,to lower the underground water level and dig trenches around the bases of the stone walls.
(a) to lower the underground water level and dig trenches
(b) to lower the underground water level and to dig trenches
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