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还有一个疑问: and estimated....中的estimated和什么平行？believe 吗?

答案里面说estimated that不符合语法,是针对这道题来说的,还是任何时候都不可以?

因为针对这道题来说,estimated前有fragments,如果加that就变成estimated fragments that...,显然不符合语法

是对的。estimate that后面跟clause，这里that后面不是clause，所以就fragment啦……

to be 可以表示一种“模糊”的感觉，所以前面是用的动词大多数都是estimated，anticipated，thought and etc

这里的estimated不应该是are estimated的么？以为习语是be estimated to be。

"estimated to be" is parallel with "unearthed", as modifying the subject "fragments".

acctually, this is kind of changed from the passive construction, which originally is

重读句子，明白了，unearthed和estimated是过去分词。多谢楼上。

at表示时间时只能是指某一点的时间,如at six在六点,at that moment在那一刻

google 了一下，estimated at ... years old 用法也好多，估计是ETS不喜欢。

The new finds include a child's leg bones so tiny that they snuggle neatly on a
bank note and an adult's lower jaw estimated at 15000 years old.

以下是引用hyte在2006-2-11 19:45:00的发言：
我看我補習班老師(我是台灣的學生)解釋是說,at 40 to 44 million years old這段話中~at 40 to 44 million years算是副詞,修飾後面的old(這裡的old作形容詞) 所以不能用estimate at,因為 estimate at+N. 各位覺得有道理嗎?? 我自己也一直在思索!

我的理解：这里之所以用to be可以参考OG－9的解释：
OG-9: ...explosion, one they believe to be of a type previously unknown....
OG解释：the infinitive to be ... referring to an event that occurred long ago but has been discovered only recently.

我觉得科学发现一类的句子按照这种理解是讲得通的，请指正。

以下是引用titatita在2005-12-29 12:45:00的发言：

根据薄冰语法

at表示时间时只能是指某一点的时间,如at six在六点,at that moment在那一刻

而本题中后面的是一段时间,所以不能用at

那OG140题呢，140. Rock samples taken from the remains of an asteroid
about twice the size of the 6-mile-wide asteroid that
eradicated the dinosaurs has been dated to be 3.47
billion years old and thus is evidence of the earliest
known asteroid impact on Earth.
(A) has been dated to be 3.47 billion years old and
thus is
(B) has been dated at 3.47 billion years old and thus
(C) have been dated to be 3.47 billion years old and
thus are
(D) have been dated as being 3.47 billion years old
and thus
(E) have been dated at 3.47 billion years old and
thus are
Agreement; Idiom
Th e plural subject of this sentence, Rock samples,
requires plural verb phrases—have been dated and
are rather than has been dated and is. Th e idiomatic
way of expressing estimation of age is with the
phrase dated at.
A Th e subject and verbs do not agree; dated to
be … is not idiomatic.
B Th e subject and verb do not agree; the
conjunction and thus should be followed by
a verb.
C Dated to be is not idiomatic.
D As being is not idiomatic; the conjunction
and thus should be followed by a verb.
E Correct. Th e plural verbs match the plural
subject, and the wording of the sentence is
idiomatic.
Th e correct answer is E.

是因为不同的词有不同的搭配吗

-- by 会员 lynnezhou小白 (2010/11/21 12:40:11)