For example, if the sentence reads - "No other wave is more concentrated than the wave that brought 12 million immigrants to shore"
So there was a wave that brought 12 million immigrants and that wave completed its action.
That's the issue. The moment you say: No other wave is more concentrated
, it does not
mean there was a wave
. It means: there is a wave
, which is obviously incorrect, because the wave clearly does not
exist any more; it started and finished in the past, and hence, the use of simple past
is most suitable.
But till now no other wave is more more concentrated ( (a fact that is still current in the present) than the wave in the past (the one that brought 12 million immigrants)
Yes, and the use of present perfect
: Of all the vast tides of migration that have swept through history
in the sentence is making it clear that till now
no wave has even been more concentrated.
GMAT - 99th Pecentile, MBA-ISB, Faculty @ http://www.EducationAisle.com
Our book Sentence Correction Nirvana available at
Amazon: Sentence Correction Nirvana
Flipkart: Sentence Correction Nirvana