The math question was optional, but every one did it.
The word problem was optional.
Bucket seats are an optional feature on this model.
the homework we had today was optional because we were really good in school today ......but still everyone did it
He could do arithmetic in his head *really fast. *optional
Joshua Goschnick and Lachlan Thomas, (By) is optional
"Etc" will usually come at the end of a list, so no. I believe that it is optional to put a period after it if it is not at the end of a sentence.
Complex (APEX)
Pigs, horses, cows, chickens, cocks, ducks (optional), donkeys (optional), sheep, goats, cats (optional), dogs (optional), bull, bunny (optional), turkey (optional).
If you want complete neutrality, the best sentences are those without subject, verb or object. Punctuation is optional.
no bond is not an optional money. A cheque can be a form of optional money.
no, it is optional
Yes, in most cases, you should use a comma after the phrase "every day" at the beginning of a sentence to separate it from the rest of the sentence. For example, "Every day, I go for a run in the park."