Parallelsim: Subordinate Clauses

[xycdfr]

I am confused whether subordinators must be the same in the situation of clauses parallelism.

In Chapter 4 of Manhattan GMAT SC 5th Edition, it says " the subordinators do not have to be identical" and provides a right example: There are many people WHO speak English BUT WHOSE parents do not

However, in Chapter 11 it says "Only clauses starting the same word should be made parallel", also with a right example: A masodon carcass, Which has been thawed only once AND which is still fresh, is on display.

I found the two conclusion are contradicted, please kindly help on this.

[RonPurewal]

well, the cool thing is that you don't really have to deal with this issue, because the problems are multiple-choice.

the issue you're raising would be an issue only if YOU actually had to write the sentences. you don't, so it's a non-issue.
your job is simply to keep the choices with the BEST parallelism and eliminate the inferior ones.
so...
...if you see a perfect match, great! it wins.
...if you don't, then simply keep the choice(s) in which the parallelism is as good as possible.

[RonPurewal]

this thread is now locked, since it's in the wrong place. if you have questions about the strategy guides, please post them in the MGMAT non-CAT folder.
thank you.