Which of these endings will NOT create parallel structure for the following sentence stem?

He was running, jumping, and

hiding behind bushes.

sliding under fences.

climbed a tall tree.

singing a song.

The answer is C - climbed a tall tree. All of the other answers end with the same tense that is used in the beginning portion of the sentence. The answer would be the "climbed a tall tree" because it does not match the tenses used in the beginning of the sentence. Finish the sentence with each of your answer options and choose the one that sounds incorrect.

The statement that does not follow a parallel structure is climbed a tall tree as the verb is written in the simple past tense, while the others are in the past progressive tense.