The statements that use parallel structure are:
- I ate tacos, beans, and rice for dinner last night.
- Mary's favorite activities include cheerleading, parasailing, and hiking.
- I came; I saw; I conquered.
- The angry dog barked at his owner, scratched the door, and created a mess.
- To succeed is to be happy in life.
- Jacob would like to buy both a new hat and a new laptop.
These all present repetition of a chosen grammatical form within a sentence, thus keeping the rhythm of th line.
"He exercised while I watch television." because the tenses of the verbs don't match--"exercised" is past tense and "watch" is present.
Explanation:
it depends on what type of situation are you using it and or the subject you are asking for
