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Sentence Correction: Preposition Questions - Split Constructions

Many dog owners do not look or love their pets, but it is difficult for authorities to know whether abuse is taking place.

This answer choice is grammatically incorrect. The verb look requires a preposition in order to logically connect to their pets. One cannot look one's pet but one can look after one's pet.

What helps us identify this question as a Split Construction question and identify the mistake is the following Stop Sign:

A split construction: Verb A + and/or + Verb B + object

Although this answer corrects the original Split Construction error by inserting the preposition after, in the GMAT, the addition of the phrase or not at any point after the word whether is considered redundant.

Although this answer corrects the original Split Construction error by inserting the preposition after, in the GMAT, the addition of the phrase or not at any point after the word whether is considered redundant.

Although this answer corrects the original Split Construction error by inserting the preposition after, in the GMAT, If is used in Conditionals only. If you see if in a sentence and there's no condition, you should replace if with whether.

Think of whether as a choice between two possibilities dealing with the same subject or as a yes/no question.

Example: I do not know whether this will work. (yes or no)

He was not sure whether he wanted banana or chocolate cake. (a choice between 2 possibilities)

Nice!

The verb look requires a preposition in order to logically connect to their pets.
This answer corrects the original Split Construction error by inserting the preposition after.

or love their pets, but it is difficult for authorities to know whether abuse is taking place
after or love their pets, but it is difficult for authorities to know whether or not abuse is taking place
after or love their pets, but it is difficult for authorities to know if abuse is taking place
after or love their pets, but it is difficult for authorities to know whether abuse is taking place
after or love their pets, but authorities find it difficult to know whether abuse is taking place or not