ACT English: Master Apostrophes for Possessives and Contractions

Rule 1: Use 's to make a singular noun possessive. Example: "the student's book" (the book belongs to one student). Rule 2: Use only an apostrophe (') to make a plural noun possessive. Example: "the students' books" (the books belong to multiple students). Rule 3: Don't use an apostrophe for plural nouns that don't show possession. Example: "The students attended class" (no apostrophe; "students" is just plural, not possessive). These three rules cover at least 95% of apostrophe errors on the ACT, so memorize them and apply them mechanically.

Quick drill: "The teacher's grade book" (one teacher, possessive, add 's). "The teachers' grade books" (multiple teachers, possessive, add only '). "The teachers graded the exam" (plural, not possessive, no apostrophe). Once you understand the pattern (singular adds 's, plural adds '), apostrophe errors become obvious.

Trap 1: Using apostrophes for plural nouns. "The apple's are ripe" is wrong; it should be "The apples are ripe" (no apostrophe). Trap 2: Confusing its/it's. "It's" is a contraction for "it is." "Its" is possessive. Example: "It's raining, and its effects are visible." Trap 3: Placing the apostrophe in the wrong spot on plural possessives. "The students' books" is correct, but "The student's books" (singular) means one student has multiple books. Trap 4: Adding apostrophes to contractions incorrectly. "Don't" (do not) is correct; "do'nt" is wrong. The apostrophe in contractions replaces the missing letter(s), not added randomly.

Create a one-page reference sheet with the three rules and example pairs (teacher's/teachers', student's/students'). Tape it to your wall and reference it whenever you do grammar practice. By test day, apostrophe placement will be automatic.

Sentence 1: "The cats' toys are in the closet." Check: Multiple cats (plural), possessive, so apostrophe after "s." Correct. Sentence 2: "Its a beautiful day." Check: This should be "It's" (it is). Correct to "It's a beautiful day." Sentence 3: "The manager's office is on the third floor." Check: One manager, possessive, add 's. Correct. Sentence 4: "The teams' uniforms were redesigned." Check: Multiple teams, possessive, apostrophe after "s." Correct. Sentence 5: "Dont forget your homework." Check: This should be "Don't" (do not). Add apostrophe for the missing "o". Correct to "Don't forget your homework."

Now find five apostrophe questions from a practice test and solve them using the three rules. Identify whether the noun is singular or plural, and whether it's possessive. By the fifth question, apostrophe placement will feel automatic.

Apostrophe errors appear on nearly every ACT English test and are consistently tested. Because the rules are simple and mechanical, this is one of the easiest skills to master for quick score gains. Learning to spot apostrophe errors picks up 1-2 points on the English section because these errors are so common and the fix is straightforward once you know the rules.

Drill apostrophe questions daily this week. Mark each noun and determine if it's singular or plural, and if it's possessive. By test day, you'll spot apostrophe errors faster than almost any other grammar mistake.