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A comment on Bilingualism makes the mind sharper (and helps forestall Alzheimer's). Parent comment

Re:Bilingualism makes the mind sharper (and helps forestall ... by riffraff on Tuesday May 31, 2011 @04:43PM (#2604464)
pardon this non-native, but shouldn't "We are looking for two students that are studying language pedagogy." be "We are looking for two students _who_ are studying language pedagogy." or possibly _which_ ? Or are they equivalent?
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Re:Bilingualism makes the mind sharper (and helps forestall ... by T-R on Thursday June 02, 2011 @05:27AM (#2611264)
In this case, 'who' and 'that' are mostly equivalent. If you're talking about a specific person, sometimes 'who' is the only choice, but here it probably doesn't matter.

'Which' wouldn't be used here because 'are studying language pedagogy' is restricting/filtering 'students', and so it's essential to the meaning of the sentence. 'Which' is used for clauses that add non-essential information.

    My shirt that is red is upstairs.
    My shirt, which is red, is upstairs.
The first sentence is contrasting the subject with other shirts (..., but my blue shirt is not). In the second sentence, there's only one shirt being discussed - it happens to be red, but even if that information was left out, it wouldn't change what shirt you were discussing.
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