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Verbs name actions which can be taken by some object. Sometimes all we have to do to change a verb from present to past tense is add -ed. But sometimes it's more complicated than that. Here are the rules for adding -ed to a verb.
1. DROP THE Y AND ADD -IED Use on words which end with Y like: carry/carried, hurry/hurried But not on words like: play/played, annoy/annoyed 2. DOUBLE THE FINAL CONSONANT AND ADD -ED Some words required that you double the final consonant and then add -ed: drag/dragged, stab/stabbed, slam/slammed 3. ADD -ED With most words you can just add -ed: climb/climbed, kick/kicked Some words you just add -d: tie/tied, trade/traded, race/raced Also on words which end with ss, ch, x, or sh: reach/reached, fix/fixed
break/broke build/built tear/tore sing/sang write/wrote go/went swim/swam sit/sat hold/held eat/ate grow/grew stand/stood fall/fell take/took read/read buy/bought spread/spread run/ran