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英文的词根 (word root) 跟中文的部首一样，透过词根跟部首可以猜测一个字的意思。在英文里，一个字后面接不同的字尾 (suffix) 可以让一个字拥有不同的词性或意思，英文初学者熟悉字尾之后可以减少口说及写作时非常多文法的错误。这里我们整理出几个最常用的字尾及其词性，文末美丽的字尾 vs. 词性海报要搜藏起来喔！
代表名词 (noun) 的词尾
| Root (词尾) | Meaning (意思) | Examples (例子) |
| -ant | person or thing (人或物) | assistant (助理), disinfactant (消毒剂/物) |
| -ar | person or thing (人或物) | scholar (学者) |
| -cy | being (状态) | dependency (依赖), democracy (民主) |
| -er | person or thing (人或物) | worker (工人), eraser (橡皮擦/擦拭物) |
| -ence | being (状态) | confidence (自信), dependence (依赖) |
| -hood | being (状态) | childhood (童年), parenthood (家长) |
| -ism | belief (主義，理論) | capitalism (资本主义), Taoism (道教) |
| -ist | person | artist (画家), realist (务实的人) |
| -ment | action (动作) | payment (付款), agreement (同意) |
| -ness | being (状态) | kindness (善良), darkness (黑暗) |
| -or | person | doctor (医生), author (作家) |
| -ship | quality (素质) | friendship (友谊), sportsmanship (运动精神) |
| -sion | action (动作) | decision (决定), passion (热忱), |
| -tion | action (动作) | action (动作), relation (关系) |
| -ty | being (状态) | clarity (清晰), penalty (惩罚) |
| -y | being (状态) | beauty (美) |
代表形容词 (adjective) 的词尾
| Root (词尾) | Meaning (意思) | Examples (例子) |
| -able | can be… (可以/有…的) | readable (可以读的), doable (可行的) |
| -ant | like… (像…的) | vacant (闲置的), vibrant (生动的) |
| -al | related to… (与…有关的) | natural (自然的), logical ((有)逻辑的) |
| -ful | full of… (具有…的) | colorful (多彩的), beautiful (美丽的) |
| -ible | can be… (可以/有…的) | credible (有信用的), edible (可食用的) |
| -ic | similar to… (与… 相关，如…的) | athletic (体育(相关)的), empathetic (有同情心的) |
| -ish | similar to… (与… 相似，如…的) | childish (幼稚的), greenish (像绿色的) |
| -ent | related to… (与…有关的) | confident (有自信的), different (不同的) |
| -ive | has qualities of… (有…特质的) | active (主动、好动的), creative (有创造力的) |
| -like | like… (像…的) | child-like (像小孩一样的), 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 (无害的), colorless (无色的) |
代表动词 (verb) 的词尾
| Root (词尾) | Meaning (意思) | Examples (例子) |
| -ate | to make [noun] (使…发生) | relate (关系), originate (起源) |
| -en | to make [adj] (变成…) | lessen (减少), darken (变暗) |
| -ify | to make [adj] (变成…) | clarify (解释清楚), magnify (放大) |
| -ize | to make [noun/adj] (使…发生/变成…) | organize (整理), familiarize (熟悉) |
代表副词 (adverb) 的词尾
| Root (词尾) | Meaning (意思) | Examples (例子) |
| -ly | describes adj (形容形容词) | happily (开心地), greatly (非常地) |
为了方便分享及英文老师使用及学生学习，我们做了以下的字尾 vs. 词性的海报，老师跟学生可以直接下载使用：
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