https://www.khanacademy.org/humanities/grammar/punctuation-the-comma-and-the-apostrophe/apostrophes-and-contractions/v/introduction-to-the-apostrophe-the-apostrophe-punctuation-khan-academy 2020-06-23T07:22:41Z Introduction to the apostrophe David and Paige, KA’s resident grammarians, introduce a new piece of punctuation: the apostrophe!  video https://cdn.kastatic.org/googleusercontent/S0M5zYeLrh9951bG6f6D1jjIi_l-0bbB2i50voX3ECal4DxH_Jny3oBaYeEMWvkcXMe3MNgky3JlFhRWAJJ51ytX3A Introduction to the apostrophe David and Paige, KA’s resident grammarians, introduce a new piece of punctuation: the apostrophe!  https://cdn.kastatic.org/ka-youtube-converted/o6zzLAhEyqo.mp4/o6zzLAhEyqo.mp4 290 Apostrophes https://www.khanacademy.org/ela/9th-and-10th-grade-grammar/xf006c25352e869bb:punctuation-and-capitalization-9/xf006c25352e869bb:apostrophes-9/a/using-apostrophes-to-show-possession-grammar-9 2026-07-13T19:41:05.916442654Z Using apostrophes to show possession Learn how to use apostrophes to form possessive nouns. article https://www.khanacademy.org/ela/9th-and-10th-grade-grammar/xf006c25352e869bb:punctuation-and-capitalization-9/xf006c25352e869bb:apostrophes-9/e/apostrophes-grammar-9 2026-07-13T19:41:05.916442654Z Apostrophes Practice using apostrophes to show possession or show that a word is a contraction. Practice identifying plural nouns that should take apostrophes. David Rheinstrom exercise