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29 Aug 2018, 00:56
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The simplest way to choose between C and E is to look at the subject-verb pair in the last part of the sentence:
E) the ability . . . has created
That works fine. The ability to adjust has created a new class of mammals.
C) to be able . . . has created
We can't do this. We can occasionally use the infinitive as a subject, but it's in very specific cases. We can do it to compare two different activities, both expressed in infinitive form: "To live is to change." We can also use it in an inverted construction, placing it at the beginning of a sentence that would normally have it at the end: "To fly is my greatest dream" in place of "My greatest dream is to fly." However, we can't simply replace any old noun with an infinitive and have a valid construction. If we ask "What has created a new class?" we can't answer "to be able," because it simply isn't a noun.
E) the ability . . . has created
That works fine. The ability to adjust has created a new class of mammals.
C) to be able . . . has created
We can't do this. We can occasionally use the infinitive as a subject, but it's in very specific cases. We can do it to compare two different activities, both expressed in infinitive form: "To live is to change." We can also use it in an inverted construction, placing it at the beginning of a sentence that would normally have it at the end: "To fly is my greatest dream" in place of "My greatest dream is to fly." However, we can't simply replace any old noun with an infinitive and have a valid construction. If we ask "What has created a new class?" we can't answer "to be able," because it simply isn't a noun.
24 Mar 2019, 20:18
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according to Ron at manhantan forum, to do is used to show a hypothetical, non fact action. this is not fit in this problem logically
17 May 2019, 21:54
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geturdream
pls, explain more why we need a noun to complete sentence, not "to do"
