<p>Here is the question: </p>
<p>A wiki is a Web site that uses simple software designed to allow the site's content (be altered or changed) by anyone who has access. </p>
<p>(A) be altered or changed
(B) to be altered or be changed
(C) to be altered
(D) be changed
(E) being changed</p>
<p>Can someone explain to me why the answer is C and not B? Any help is greatly appreciated. Thanks!</p>
<p>to be altered is the infinitive phrase here. B is obviously incorrect because of its redundancy since change and alter mean the same thing.</p>
<p>Oh sorry my mistake, haha! I meant to ask why the answer is C and not D…</p>
<p>again, to+(verb) is in infinitive form. in this sentence, to be altered is an infinitive phrase which functions as an adv(describing why the software is being used).
remember ‘be’ is in infinitive and is never used without a to before it. </p>
<p>for example, i eat to stay alive. to stay alive explains why i eat. functions as adv here.
another example, the method to achieve happiness is emptiness of your mind. to achieve happiness is used to describe method and therefore functions as an adj.
to read is beneficial. to read acts a noun.</p>
<p>Okay, thank you so much Yangfizz! :)</p>