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题库 / OG2015-SC-30
Paleontologists believe that fragments of a primate jawbone unearthed in Burma and estimated at 40 to 44 million years old provide evidence of a crucial step along the evolutionary path that led to human beings.
at 40 to 44 million years old provide evidence of
as being 40 to 44 million years old provides evidence of
that it is 40 to 44 million years old provides evidence of what was
to be 40 to 44 million years old provide evidence of
as 40 to 44 million years old provides evidence of what was
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manhattan SC idiom 265页只有estimate to be 记住了
其他BCE因为provides和fragments 主谓不一致
本体作主语，estimate to be；属性作主语，estimate at
X estimate fragments to be 40 to 44 million years old.
SVOC结构，estimate主观性强，宾补用不定式
请问一下estimate at什么情况下是正确的呢？
关于estimate后面是+at，还是+to be的情况，CD上有前人总结过。当回搬运工：
当age, cost, price, expenditure等 做主语，用at, to be都行：The cost is estimated at/to be 100$. 注意：可不可以用at关键是看is estimated前面的东东（what is estimated to be/at），或estimate后面的东东(I estimate what to be/at)。估计任何东东数字的属性，如果estimate 属性（age,cost,price, The price of the gadget is estimated at 10 $.）, 可以用at/to be；如果estimate该东东，即属性的主体（如有该age的人或化石，该price的商品The gadget is estimated to be 10$）则只能用to be. The price of the gadget是The gadget的属性。
希望有帮助~~
对于estimate的用法，简单地讲：当age,cost,price,等为主语， 比如The price of the gadget is estimated at 10 $,这里The price of the gadget是The gadget的属性，可以用at/to be都行；如果属性的本体作主语——The gadget is estimated to be 10$，则只能用to be.
小结一下：属性作主语，则用estimate to/at都可以；本体做主语，则只能用estimate to
根据这个笔记，这里的fragments应该是属性吧 为什么不能用at呢
这里年份的属性应该要用the age of the fragment，而不是fragment本身吧
您好，请问下在哪里能找到关于estimate用法之类的总结啊，谢谢
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BCE主谓不一致,estimate...to be, estimate at后一般跟地名