by ChrisB Sun Nov 21, 2010 12:58 pm
Hi,
Your question is very general and depends on the context. With the specific question you've asked the "although" signals that you're comparing what happens in the two clauses so each must be parallel with the other.
That said, parallelism in general must be enforced within a clause and sometimes relationships between clauses dictate that the clauses be parallel as well. Still, clauses should only be parallel if they need to be. For example, in "I had been at school for two years when I realized I hated studying" had been and hated don't have to be in the same verb tense and forcing these two verbs to be parallel would change the meaning in a nonsensical way.
If you have specific questions from the strategy guide please post them here, and if you have questions from our CAT or the GMAT prep exam then you can post them in the other forums as well.
Thanks,
Chris
Chris Brusznicki
MGMAT Instructor
Chicago, IL