Use an apostrophe with words to show possession or when using contractions. For the word “it,” do not use an apostrophe to show possession, but do use an apostrophe if it is a contraction. Learn about using apostrophes for plural words that also express possession with information from awriter and English tutor in this free video on grammar and punctuation. Expert: Heather Kamins Bio: Heather Kamins was diagnosed with lupus when she was 14 years old, and has dealt with kidney involvement, joint problems, medication side effects and other lupus-related issues. Filmmaker: Dimitri LaBarge