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The whole question of when purpose clauses need or don't need subjects should be addressed where purpose clauses are explained.
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<div>From: "luis.chaparro--- via tlhIngan-Hol" <tlhingan-hol@lists.kli.org> </div>
<div>Date: 5/13/23 11:50 AM (GMT-05:00) </div>
<div>To: tlhingan-hol@kli.org </div>
<div>Cc: luis.chaparro@web.de </div>
<div>Subject: Re: [tlhIngan Hol] wishlist for TKD 3ed </div>
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<div class="PlainText">> Your suggestions are good, but I think they are <br>
>> 3. When isn't *-lu'* necessary in purpose clauses when expressing an indefinite subject?<br>
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> I'm not sure I understand the question. Can you give examples?<br>
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As far as I know, when a purpose clause modifies a *noun*, there is *usually* no subject and no *-lu'*, but there are (unexplained) exceptions to it. See for example the second point here:
<a href="http://lists.kli.org/pipermail/tlhingan-hol-kli.org/2021-July/058919.html)">
http://lists.kli.org/pipermail/tlhingan-hol-kli.org/2021-July/058919.html)</a>.<br>
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