<p>More than forty years [HAVE PASSED] [SINCE] a quarter of a million people marched on Washington, D.C., [IN AN ATTEMPT] [TO SECURE] civil rights for Black Americans. [NO ERROR]</p>
<p>THIS WAS NO ERROR. I THOUGHT IT WOULD BE [HAD PASSED] INSTEAD OF [HAVE PASSED]</p>
<p>Norwegian writer Sigrid Undset [IS LIKE] the novelist Sir Walter Scott [IN] her use of historical backgrounds, but unlike [HIS BOOKS], she dwells on the psychological [ASPECTS OF] her characters. [NO ERROR]</p>
<p>[HIS BOOKS] WAS WRONG, I'M NOT SURE WHY.</p>
<p>The television station [HAS RECEIVED] many complaints [ABOUT] the clothing advertisements, [WHICH SOME] viewers condemn [TO BE] tasteless. [NO ERROR]</p>
<p>THIS WAS [TO BE] . WHY IS THERE SOMETHING WRONG WITH [TO BE]</p>
<p>Winston Churchill, [UNLIKE] many English prime ministers [BEFORE HIM], had deep insight [INTO] the [WORKINGS OF] the human mind. [NO ERROR]</p>
<p>THE ANSWER IS [NO ERROR]. I THOUGHT IT WOULD'VE BEEN [IN] INSTEAD OF [INTO].</p>
<p>1) No, don’t use the past perfect tense. Then the sentence would be saying that 40 years passed, then the marchers marched on D.C. It’s the other way around - the marchers marched, and then 40 years passed.</p>
<p>1) (Had passed) can only be used if the sentence has another past verb which occured before the(passing)
2)(his books) is wrong because it is a Misplaced modifier, you are comparing books to books not books to a writer.
3)Condemn (being). you cant use condemn with an infinitive. Memorize that.
4)Just a prepostional-idiom phrase you will have to learn.</p>
<p>^ @IceQube why do you always have to beat me in posting…</p>
<p>Are my answer explanations correct ?</p>
<p>I think for 1.</p>
<p>It should be left as is.</p>
<p>Edit: Explanation would be because if you use "had’ passed, then you would need something else to be in the past (a past verb) to say that 40 years ago 1/4 of a million people marched, or it would seem like 40 years passed then a 1/4 of a million people marched in D.C.</p>