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Towing insurance provides protection against collision damage to your automobile while you are attaching (it) to, towing (it) by, or detaching it from a covered rental truck or while it is loaded onto, transported, or unloaded from a covered rental trailer.

Can you explain why the pronoun 'it' (indicated in bracket above) can be omitted from the list used as above?

Edit
Answer analysis are as follows:

Towing insurance provides protection against collision damage to your automobile while being attached, towed, or detached from a covered rental truck, or loaded onto, transported, or unloaded from a covered rental trailer

(A) while being attached, towed, or detached from a covered rental truck, or loaded onto, transported,

Incorrect due to lack of pronoun and be verb, making 'insurance' the subject of the verb 'attach'. There is also a lack of a parallel marker after 'or': While [it is] being...., or [While it is]

(B) while you are attaching to, towing by, or detaching it from a covered rental truck or while it is loaded onto, transported,

This option correctly refers 'automobile' [it] as the subject of the verb 'attach...'. Correct use of parallelism.

(C) when attached to, towed by, or detached from a covered rental truck or when it is loaded onto, transported by,

Same as A. Lack of pronoun referring to 'automobile', thus making 'insurance' the subject of the verb 'attach'. Incorrect parallelism.

(D) while you being attached to, towed by, or detached from a covered rental truck or loaded onto, transported by,

Similar to A and C. Wrong use of pronoun, aking 'you' subject of the verb 'attach'. Omission of parallel marker.

(E) when being attached to, towed by, or detached from a covered rental truck or loaded, transported,

Same as A and C, wrong subject and parallelism.

Hope this helps and please feel free to correct me if any of the above is incorrect!

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  • This comes from the following multiple choice question (see also here), apparently from the GMAT exam. Please add that information to your question, and explain why you think that this (option B) is the correct answer. Commented Jan 16, 2021 at 21:58
  • For completeness, here is the full text: Towing insurance provides protection against collision damage to your automobile while being attached, towed, or detached from a covered rental truck, or loaded onto, transported, or unloaded from a covered rental trailer. [see next comment for possible answers] Commented Jan 16, 2021 at 22:06
  • (A) while being attached, towed, or detached from a covered rental truck, or loaded onto, transported, (B) while you are attaching to, towing by, or detaching it from a covered rental truck or while it is loaded onto, transported, (C) when attached to, towed by, or detached from a covered rental truck or when it is loaded onto, transported by, (D) while you being attached to, towed by, or detached from a covered rental truck or loaded onto, transported by, (E) when being attached to, towed by, or detached from a covered rental truck or loaded, transported, Commented Jan 16, 2021 at 22:08

2 Answers 2

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(B) is incorrect. You need either:

attaching to / towing by / detaching from a covered rental truck

or

attaching it to / towing it by / detaching it from a covered rental truck

You also need a preposition here:

loaded onto, transported by, or unloaded from a covered rental trailer

Assuming this insurance is held by the tow truck operator (not the automobile owner), this is correct-ish*:

Towing insurance provides protection against collision damage to an automobile while you are attaching it to, towing it by, or detaching it from a covered rental truck or while it is loaded onto, transported by, or unloaded from a covered rental trailer.

*Stylistically, the while clauses should both use the same voice—active or passive—and the same aspect—progressive or simple. Try this instead:

Towing insurance provides protection against collision damage to an automobile while it is being attached to, towed by, or detached from a covered rental truck or loaded onto, transported by, or unloaded from a covered rental trailer.

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Yes, but this has nothing to do with pronouns and in general in English, pronouns receive no special status with regards to the rules of dropping.

Rather, in English, in ellipses formed by conjunctions, virtually all parts of the sentence can be omitted; they are inferred to be repeated from a following or prior sentence. Note that “while you are” is also omitted as repeated from the first sentence, and “it” is omitted, inferred to repeat from the last, thus the full clause would be:

while you are attaching to it, while you are towing it, or while you are detaching it

The rules for order are somewhat complicated, in this case it feels the most natural to place “while you are” in the first sentence and “it” in the last sentence, as you did, probably because verbs can be so easily conjoined, this isn't always the case:

John saw me, and I Sally, and Jack Peter.

In this case, the verb is only placed in the first segment, and inferred repeated in the others, with the subjects and objects specified as different in the second and third clause.

This, however, does not work:

*John saw him, and I, and Jack

Only stating the subject does not repeat the object in this order; the object itself has to be given in each clause.

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