Sarah is drafting a preparation outline, and she maintains parallel structure in her main points. In this case, her main points are parallel in structure if:

a. they begin with an active verb.
b. they are in the form of paragraphs.
c. they are provided by a supporting material.
d. they follow a variety of sentence structure.

a. they begin with an active verb.
In this case, Sarah’s main points are parallel in structure if they begin with an active verb. Parallel structure means the main points follow the same structural pattern. It can be achieved by numbering or starting each sentence with an active verb.