Periods (.) and Ellipses (…)

1. Use the period at the end of an affirmative or negative statement.

Example: He isn’t available today. You should call back tomorrow.

2. Use the period after an indirect question.

Example: He asked where his suitcase was.

3. If the last word in the sentence ends in a period, do not follow it with another
period.

Example: I know that M.D. She is my sister-in-law.  (M.D. – Medical Doctor)

4. If part of a sentence is directly quoted and some words are left out, ellipses
replace the missing words.

Example: The original sentence: All students must inform their teacher by email or phone when they are unable to attend class.

The teacher wrote that “all students must inform their teacher … when they are unable to attend class. (missing words: by e-mail or
phone)