Parallel Structure in Writing

Parallel structure is the use of similar grammatical forms or matching things to express related ideas.

Recommended exercise includes to run, to swim, and cycling.

Recommended exercise includes running, swimming, and cycling.

Recommended exercise includes running, swimming, and to cycle.

Recommended exercise includes running, to swim, and cycling.

go swimming

swim

go to swim

butterflies

she also likes butterflies

butterflies aren't her favorite, but she likes them okay

to catch lightning bugs

The quality of the student are as follows:

Participates in discussions

Determined to complete work

Quiet in class 

The quality of the student are as follows:

Participates in discussions

Talks a lot

Completes work on time

The raccoon moved quickly, quietly, and smoothly. 

The raccoon moved quickly, made noise, and smoothly.

as it is

kindly, professionally, and helpfully.

kindly, to be professional, and helpful.

customers kindly, to be professional, and to be helpful.