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英文的詞根 (word root) 跟中文的部首一樣，透過詞根跟部首可以猜測一個字的意思。在英文裡，一個字後面接不同的字尾 (suffix) 可以讓一個字擁有不同的詞性或意思，英文初學者熟悉字尾之後可以減少口說及寫作時非常多文法的錯誤。這裡我們整理出幾個最常用的字尾及其詞性，文末美麗的字尾 vs. 詞性海報要蒐藏起來喔！
代表名詞 (noun) 的詞尾
| Root (詞尾) | Meaning (意思) | Examples (例子) |
| -ant | person or thing (人或物) | assistant (助理), disinfactant (消毒劑/物) |
| -ar | person or thing (人或物) | scholar (學者) |
| -cy | being (狀態) | dependency (依賴), democracy (民主) |
| -er | person or thing (人或物) | worker (工人), eraser (橡皮擦/擦拭物) |
| -ence | being (狀態) | confidence (自信), dependence (依賴) |
| -hood | being (狀態) | childhood (童年), parenthood (家長) |
| -ism | belief (主義，理論) | capitalism (資本主義), Taoism (道教) |
| -ist | person | artist (畫家), realist (務實的人) |
| -ment | action (動作) | payment (付款), agreement (同意) |
| -ness | being (狀態) | kindness (善良), darkness (黑暗) |
| -or | person | doctor (醫生), author (作家) |
| -ship | quality (素質) | friendship (友誼), sportsmanship (運動精神) |
| -sion | action (動作) | decision (決定), passion (熱忱), |
| -tion | action (動作) | action (動作), relation (關係) |
| -ty | being (狀態) | clarity (清晰), penalty (懲罰) |
| -y | being (狀態) | beauty (美) |
代表形容詞 (adjective) 的詞尾
| Root (詞尾) | Meaning (意思) | Examples (例子) |
| -able | can be… (可以/有…的) | readable (可以讀的), doable (可行的) |
| -ant | like… (像…的) | vacant (閒置的), vibrant (生動的) |
| -al | related to… (與…有關的) | natural (自然的), logical ((有)邏輯的) |
| -ful | full of… (具有…的) | colorful (多彩的), beautiful (美麗的) |
| -ible | can be… (可以/有…的) | credible (有信用的), edible (可食用的) |
| -ic | similar to… (與… 相關，如…的) | athletic (體育(相關)的), empathetic (有同情心的) |
| -ish | similar to… (與… 相似，如…的) | childish (幼稚的), greenish (像綠色的) |
| -ent | related to… (與…有關的) | confident (有自信的), different (不同的) |
| -ive | has qualities of… (有…特質的) | active (主動、好動的), creative (有創造力的) |
| -like | like… (像…的) | child-like (像小孩一樣的), moon-like (像月亮的) |
| -y | full of… (像/有…的) | sleepy (想睡的), icy (如冰的) |
| -less | without… (沒有…的) | harmless (無害的), colorless (無色的) |
代表動詞 (verb) 的詞尾
| Root (詞尾) | Meaning (意思) | Examples (例子) |
| -ate | to make [noun] (使…發生) | relate (關係), originate (起源) |
| -en | to make [adj] (變成…) | lessen (減少), darken (變暗) |
| -ify | to make [adj] (變成…) | clarify (解釋清楚), magnify (放大) |
| -ize | to make [noun/adj] (使…發生/變成…) | organize (整理), familiarize (熟悉) |
代表副詞 (adverb) 的詞尾
| Root (詞尾) | Meaning (意思) | Examples (例子) |
| -ly | describes adj (形容形容詞) | happily (開心地), greatly (非常地) |
為了方便分享及英文老師使用及學生學習，我們做了以下的字尾 vs. 詞性的海報，老師跟學生可以直接下載使用：
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