<p>HI, I have a few questions on the writing section. The following are excerpts from Barrons and PR, not necessarily with errors in them.</p>
<li>Since the clear water remains relatively shallow all the way to the breakers, which (is) about 250 feet away from the shore…</li>
</ol>
<p>Correct form. What I don’t get is why it is “is” and not “are.”</p>
<li>A glossery of terms, a section on clauses, and a list of idiomic expressions (is) included in the grammer book.</li>
</ol>
<p>Correct form. Same problem as above. Why is it “is” while a sentence with people as the subject uses the verb “are?” (as in “Tim and John are doing the dishes”)</p>
<li>The children (having had) experienced the malaise of car sickness (one) too many times, so the couple decided it was best not to venture in a (cramped) car for a (long journey).</li>
</ol>
<p>“Having had” should be changed to just “having” but I don’t understand why.</p>
<li>Despite Mitchell’s steadfast attempts to mitigate his friend’s ongoing rivalry, (he) was ultimately unable to.</li>
</ol>
<p>“He” is incorrect in this sentence though I don’t know why.</p>
<li>After the electricity (went) out, Dora stumbled (blind) (about) her apartment (searching for) a candle.</li>
</ol>
<p>The answer is “blind” and I also don’t know why.</p>
<p>Please help! Thank you :)</p>