by tim Mon Apr 08, 2013 1:43 am
It sounds like you're asking more of a parallelism question rather than an idioms question. In this case you could include a "to" or omit it and either option would be technically parallel. What you want to keep in mind in analyzing parallelism is NEVER to take a piece that shows up on the left and see if it appears on the right; instead, you should see what's on the right and try to find a match on the left. To reiterate, asking yourself whether the right hand side should include something that shows up on the left is ALWAYS wrong and reflects an approach that will often land you in trouble on SC.
Tim Sanders
Manhattan GMAT Instructor
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