Sentence Correction

Hi All,

In the Manhattan SC flash cards available at:

https://www.manhattangmat.com/pdf/FlashC ... e_2009.pdf

page#91....

the sentence given is
"Since 1973, the record was broken eight times due to technology that advanced even more rapidly than commentators have predicted."

Flash cards say the above is wrong....because

"Using "since" necessitates the present perfect ("has been broken") to indicate an action that continues to occur over time. Similarly, since records are still being broken, technology is likely still advancing (thus we must use "has advanced").
Because the commentators' predictions occurred before the records were broken and are no longer in effect, the present perfect ("have predicted") is incorrect - past perfect or simple past must be used."

The same is corrected as

"Since 1973, the record has been broken eight times due to technology that has advanced even more rapidly than commentators had predicted (or simply "predicted")."


I have one doubt about the above explanation:

Can someone please tell why can't we have simple "advanced" instead of "has advanced"...why do we need "has advanced" to be necessarily there ?

with since- present perfect is used to signal that something that started in the past is still continuing in the present

so presumably the the technology continues to advance and records continue to get broken. the advance in technology was not a one time event in the past.

scoobydooby wrote:with since- present perfect is used to signal that something that started in the past is still continuing in the present

so presumably the the technology continues to advance and records continue to get broken. the advance in technology was not a one time event in the past.

yes got it !!! thanks.

lunarpower wrote:scooby - thumbs up.

i have noticed, though, that this flash card contains an error in the use of "due to".

note that "due to" is equivalent to "caused by". since you can't use "caused by" in this context, you can't use "due to" either.

i'll sumbit this for fixing.

Thanks a lot Ron !!!!

If there are any similar issues in Flash cards, then can you please point to a errata list(if it exists) so that we can correct the same in the flash cards and do not learn something wrong !!!

lunarpower wrote: i will say, though, that there are 2 incorrect cards in the geometry section.
* page 70, card 22, is insufficient because O does not have to be the center of the circle.

Hi Ron,

Can you please tell why this is insufficient ? I guess there is only one angle that is possible to be 60 degrees.....when the the angle PSR = 30...then double of that angle with two other points as P and R has to be at centre of the circle ?

Please tell what I am missing here ?

Thanks
Mohit

Hi Ron, if "due to" is incorrect, then what do you think should come at its place. Would "because of" be correct here???

lunarpower wrote: the problem is that there are many other points that will also work, besides the center of the circle.

to get to these points, you'll have to move point O in a basically sideways direction. (in that picture, you would move point O up-and-left, or down-and-right.)

if, along with the 60 degree angle, you are given that PO = RO, then the point must be the center of the circle.

Hi Ron,

Thanks. But if this is the case then can you please why this theorem mentioned in Manhattan strategy guide is true ?

if an angle with one point on circle is of 90, then hypotenuse must be diameter....(basically converse of angle in a semi circle)..

why we cannot move points sideways there ?