 Using the same form for equal ideas creates balance in a sentence.  For example, you balance a noun with a noun, a phrase with a phrase, and a clause with a clause.  This balance is called parallel structure.

 I like reading, writing, and to draw. PARALLEL NOT PARALLEL  I like reading, writing, and drawing.

Some of these stories are funny, entertaining, and educational. Some of these stories are funny, entertaining, and teach me a lot. PARALLEL NOT PARALLEL

I knew that an airplane had crashed but not that a passenger had made a heroic rescue. I knew that an airplane had crashed but not about the passenger’s heroic rescue. PARALLEL NOT PARALLEL

1. Resting for a few moments or to take a few sips of water may help you. 2. Juan likes to read books and going to plays. 3. Jogging, skating, and to swim are Dena's favorite activities. 4. Listening carefully is as important as to read carefully. 5. Each student will develop skills in both weaving and to spin.