The clause "although the food is always delicious" might distract some people into missing the paralellism used, because it is set apart by commas. Considering "talks" and "makes," we see the present form of some verbs used in succession. For the best sentence structure, the final action should also follow the normal present verb form, like "talks" and "makes." "Complaining is constant" does not follow this, and so (C) contains the error. It would be best to say "complains constantly" or something similar.

This is a parallelism error. The verbs "jog" and "practice" begin the parallel elements in the sentence, and they are each in present tense. The verb "playing" should also be in present tense so that it matches "jog" and "practice." So, "playing" should be "play."

The sentence needs to remain parallel. If it had said "cooking," "mountain-climbing" would be ok.

This is a faulty comparison. "Sandwiches" cannot be compared to a cafeteria. Use "similar to those at the cafeteria" or something like that instead to correct the sentence's error.

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 contains parallelism—in this case, a set of sequential actions set off by commas. In sentences that have a parallel structure, all similar parts of speech should follow the same format. So, the list should read, "sifting the flour," "separating the eggs," and "putting it in the oven to bake." Instead, the way the sentence is currently written, "we put" inserts a needless repetition of the subject that interrupts the logical flow of the sentence by putting the verb in a different tense.

The correct answer is "than other artists."  As the sentence reads, it is saying that Anna thinks her friend's art is more creative than other artists, which is an incorrect comparison; she should be comparing her friend's art to the art of other artists, not to the artists themselves.

A correct phrasing would be "At the student art showcase, Anna enjoyed seeing her friend Zoe's abstract paintings, which she thought were more creative than the works of the other artists."

The verb phrase "will attend" should be changed to "attending" because it is part of a list of "-ing" verbs, all of which need to be in the same form in order for the sentence to use proper parallel structure. Since "running," "shopping," and "cooking" are already conjugated in the same way, "will attend" should be conjugated in this way too, and therefore should be changed to "attending."

This sentence lacks parallel structure between the elements in the list. Items in a list should be formatted in the same way grammatically. The corrected sentence reads, "The woman slowly became fascinated by the aliens’ strange culture, their intelligence, and their hilarious jokes."

Only like things can be compared. "My apartment" can be compared to "that of my boss" or my "boss'."