This sentence has a problem with parallelism. The items in the list should be formatted the same. The corrected sentence reads, "She aspired to someday live in Barcelona, learn Spanish, and travel through the country."

This sentence does not demonstrate proper parallel structure among the elements in the list. Each should be formatted similarly. So, because the first two elements in the list are gerunds ("running" and "cleaning"), the noun phrase "records of inventory" should be changed to a gerund as well. The corrected sentence reads, "When I worked for Mr. Tipler, my daily duties included running the cash register, cleaning the store, and recording inventory."

The forms of verbs used in a list need to agree for the sentence to use proper parallelism. Because the sentence begins its list of two items with "creating," "reduce" should be changed to "reducing" in order to match the form of "creating." So, the corrected sentence would read, "Important things to remember when adding fractions include creating a common denominator and reducing."

This sentence compares two unlike things: the action of making ice cream and the description of “store-bought.” Structure these two things similarly for the sentence to make more sense: "I would rather make my own ice cream than buy it from the store."

This sentence has a problem with parallelism. The verbs “communicate” and “solving” should be formatted in the same way, since they are the two things it was "more difficult" for Mary to do. Since only "solving it," and not "communicate," is underlined, "solving it" contains the sentence's error and is the correct answer. The corrected sentence reads, "Although it was easy for Mary to identify the problem, she found it more difficult to communicate with the technical crew and solve it."

The three elements in the list should be formatted in the same way. Since the first two are just nouns without verbals, the third should be too. The corrected sentence reads, "The evening's entertainment consisted of a jazz quartet, a juggler, and a game of musical chairs."

When making comparisons you must be careful to compare like things. In this case, the sentence as written makes a comparison between "cookies" and "my grandmother." You want to compare cookies to cookies. You can fix this error by making "grandmother" into a possessive, singular noun, "grandmother's." This way, it is inferred that the subject being spoken about is the speaker's grandmother's cookies, not the speaker's grandmother herself.

This sentence is missing a verb. Both elements after “made the man” should be verb phrases, or the sentence sounds awkward because it does not correctly employ parallelism between its elements. The corrected sentence reads, "The lack of privacy in the dorm-style boarding house made the man feel uncomfortable and miss his private estate."

This sentence does not correctly use parallel structure between elements. “Swapped” and “comparing” should be formatted similarly. The corrected sentence reads, "The buzz of unfamiliar languages filled the room as international travelers swapped stories and compared adventures."

This sentence's error is faulty parallelism. The first two of the three things listed as Roosevelt's hobbies are presented in the form of gerunds, verbs that end ing "-ing" and act as nouns. The third hobby should follow the previous examples and be written as "writing about history" instead of "wrote about history."