Series of worksheets to practice adding the suffixes -s, -es, -ed, and -ing to words. Skills included: adding -es when words end with sh, ch, ss, s, x, or z, changing y to i, dropping silent e, doubling final consonant. I included two versions of each worksheet. The first copy has the rules listed at the top to help students practice the skills. The second copy has no rules listed so it could be used as an assessment. The pages progress in difficulty, adding new rules and providing mixed practice for applying the rules.