<li><p>Above the Beautiful white-sand beach runs two rivers that eventually combine to form a waterfall cascading to the sand. </p></li>
<li><p>To stand in Persepolis in modern Iran and look out, as Darius the First must have done, at the immense sweep of fields and mountains is to grasp the vastness of the ancient Persian Empire.</p></li>
<li><p>Vanessa had a tendency of changing her mind often, so often in fact that her friends gave up expecting her to show up at their parties.</p></li>
<li><p>I put E, correct was A</p></li>
<li><p>I put B, correct was E (how is there no error in that sentence? The whole thing sounds fragmented and wrong…)</p></li>
<li><p>I put D, correct was A</p></li>
</ol>
<p>23 is A because "... run [not runs] two rivers..." b/c two rivers is plural</p>
<p>25 is E; it may sound wrong and awkward (which it is), but there is nothing grammatically wrong with this sentence</p>
<p>28 is A because it is generally a good idea to stay away from using "of ---ing" phrases (i.e. of changing); and it has to line up with "to show up at" b/c of parallelism (also, this is an idiom problem, i think)</p>
<ol>
<li>It is "A" because the verb, "runs" is improperly describing two rivers. It should read... "Above the Beautiful white-sand beach run two rivers.</li>
</ol>
<p>I'm not sure on the other two so I won't give a definite answer, but for 28. i believe it is an idiom problem. Should be: Vanessa had a tendency to change her mind often, not of changing.</p>
<p>Ah, ok thanks for the help. I still don't get the second and third one though.</p>
<ol>
<li><p>shouldn't it be "as Darius the first HAD DONE"? not "must have done," because that would create a tense error...</p></li>
<li><p>Not really parallelism in a CB sense, because it's not a list or anything. Not an idiom error either (imo) because "tendency of" is correct... right? </p></li>
</ol>
<p>I'm not saying that either of you are wrong (I got them wrong, after all), but I just wanted to understand why I got them wrong.</p>
<p>"He has a tendency to get nervous during a test."
"He has a tendency of getting nervous during a test."</p>
<p>I'm not positive but the first sentence seems better to me.</p>
<p>^ It may not seem better, but it is more grammatically sound. I've always been told to avoid those "of ---ing" phrases and to use infinitive phrases instead.</p>
<p>To address bigb14 - it must be must have done for the Darius one because we don't know if he really do that. We can assume he did, so he must have done it, but we don't know if he actually had done it.</p>
<p>is must have done still past tense? </p>
<p>once again, thanks for all the help guys</p>
<p>yeah, it's past tense (like past perfect yadda yadda or something like that.. you know, all those specifics)</p>
<p>^Gah, I hate those... oh well. K guys, thanks a lot for the help.</p>