Unit4语法(形容词后缀)讲解与练习-2026-2027学年仁爱科普版英语八年级上册

该初中英语导学案以Unit4“Changing and Growing”为主题，聚焦后缀-ful与-less的语法应用，通过“基础概念-词汇汇总-例句解析-解题技巧-综合练习”的递进式设计，构建从规则理解到语境应用的完整学习路径，系统培养学生对形容词构词法的掌握。 亮点在于结合单元主题设计情境化学习任务，如例句“半途而废是没有希望的”引导学生通过逻辑判断选择后缀，多样练习题（词形转换、汉译英等）强化语言能力，易错提醒培养学习能力，为教师实施单元复习提供针对性强的教学支持，促进学生深度学习与思维品质提升。

Unit4 Changing and Growing语法讲解与练习 后缀 -ful 与 -less详细讲义 一、基础概念 后缀（suffix） 放在名词末尾，改变单词词性，大多构成形容词。 -ful：充满…… 的；富有…… 的（肯定含义） -less：无…… 的；缺少…… 的（否定含义） 规律公式：名词+ -ful → 形容词（充满…） 名词 + -less → 形容词（无…） 二、重点词汇汇总 名词 -ful（肯定） -less（否定） 中文释义 care careful careless 细心的/粗心的 hope hopeful hopeless 充满希望的/无望的 help helpful helpless 有帮助的/无助的 pain painful painless 疼痛的/无痛的 power powerful powerless 强大的/无力的 fear fearful fearless 恐惧的/无畏的 thought thoughtful thoughtless 体贴的；深思的 /轻率的 meaning meaningful meaningless 有意义的 /无意义的 harm harmful harmless 有害的/无害的 ⚠️重要易错提醒 1.full 本身是形容词，不要写成 carefull！ ✅ careful 2.-less 本身自带否定，不要再额外加 not、un- ✅ hopeless 3.handful（一把）/spoonful（一勺）属于特例;名词后缀,不表形容词,初中了解即可。 4.读音区分：-ful /fl/；-less /ləs/ 三、例句（贴合单元主题 Changing and Growing） 1.He is a careful boy, but sometimes he is careless. 他是个细心的男孩，但有时很粗心。 2.This activity is meaningful, not meaningless. 这项活动很有意义，并非毫无价值。 3.The medicine is harmless to your body, but smoking is harmful. 这种药对你身体无害，但吸烟有害。 4.She felt helpless without her parents’ help. 没有父母帮助，她感到无助。 5.It is hopeless to give up halfway. 半途而废是没有希望的。 四、解题技巧 看到名词,根据句子逻辑肯定/否定选择后缀： 语境正向→ -ful 语境负面、缺少某物→ -less 【配套拔高练习题】 一、词形转换（用 -ful /-less变形） 1.care → ________ (细心的)；________ (粗心的) 2.hope → ________ (充满希望的)；________ (无望的) 3.help → ________ (乐于助人的)；________ (无助的) 4.harm → ________ (有害的)；________ (无害的) 5.meaning → ________ (有意义的)；________ (无意义的) 6.power → ________ (强大的)；________ (无力的) 7.fear → ________ (害怕的)；________ (无畏的) 8.pain → ________ (疼痛的)；________ (无痛的) 9.thought → ________ (体贴的)；________ (轻率的) 10.speech → ________ (滔滔不绝的)；________ (沉默的，speechless) 二、单项选择 1.Don’t be so ________. You always make small mistakes. A. careful B. careless C. hopeful D. hopeless 2.This volunteer work is ________. It helps lots of teenagers. A. meaningless B. powerless C. meaningful D. fearless 3.Smoking is ________ to your health. A. harmless B. harmful C. painless D. helpful 4.When she lost her way, she felt ________. A. helpless B. helpful C. powerful D. thoughtful 5.It is ________ to try again. We still have chances. A. hopeless B. hopeful C. careless D. meaningless 6.The little boy is ________. He dares to face difficulties. A. fearful B. fearless C. painful D. powerless 7.Your advice is ________. Thank you very much. A. useless B. helpless C. helpful D. harmless 8.He is ________ and often thinks about others. A. thoughtless B. thoughtful C. powerless D. hopeless 9.The doctor said the operation would be ________. You won’t feel hurt. A. painful B. painless C. harmful D. powerful 10.Without tools, we are ________ to finish the work. A. powerful B. powerless C. hopeful D. careful 11.It’s ________ to argue about such little things. A. meaningful B. meaningless C. helpful D. fearless 12.This kind of plant is ________ to humans. You can touch it safely. A. harmful B. harmless C. painful D. hopeless 13.Lily is a ________ student. She seldom forgets homework. A. careless B. careful C. thoughtless D. powerless 14.After many failures, he still keeps ________ about his dream. A. hopeless B. hopeful C. useless D. helpless 15.He was ________ and did not consider other people’s feelings. A. thoughtful B. thoughtless C. fearless D. powerful 三、用所给词适当形式填空 1.It’s ________ (care) of you to leave the window open. 2.Reading good books is ________ (mean). 3.Don’t worry. The chemical is ________ (harm) to people. 4.When nobody supported him, he felt ________ (help). 5.We are ________ (hope) that we will make great progress. 6.It is ________ (pain) for him to move his leg after the fall. 7.A ________ (power) mind helps you get through hard times. 8.It’s ________ (fear) of him to fight against difficulties. 9.Don’t waste time on those ________ (mean) games. 10.It is ________ (think) of you to prepare gifts for us. 四、句型转换 & 同义句改写 1.Tom is a careful student.（写出反义词） Tom is a ________ student. 2.The task is hopeless.（同义句） The task is ________ hope. 3.This activity is meaningful.（改为否定含义） This activity is ________. 4.The drug is harmless.（同义句） The drug does ________ ________. 5.She is helpful.（反义词） She is ________. 6.It’s useless to wait here.（用 meaningless 改写） Waiting here is ________. 7.He is fearless.（同义句） He has no ________. 8.The noise is harmful to our sleep.（反义词改写） The noise is ________ to our sleep. 9.He is thoughtless.（反义词） He is ________. 10.We feel powerless without your support.（同义句） We do not have ________ without your support. 五、汉译英 1.粗心的人容易犯错。 ____________________________________________ 2.阅读是一项有意义的活动。 ____________________________________________ 3.不要担心，这种材料对我们无害。 ____________________________________________ 4.在困境中，他并不感到无助。 ____________________________________________ 5.我们对未来充满希望。 ____________________________________________ 6.勇敢无畏的人敢于迎接成长中的挑战。 ____________________________________________ 7.持续熬夜对你的健康有害。 ____________________________________________ 8.体贴的人总会顾及他人感受。 ____________________________________________ 9.一味抱怨是毫无意义的。 ____________________________________________ 10.没有知识，我们会感到无力改变现状。 ____________________________________________ keys 一、词形转换 1.careful; careless 2.hopeful; hopeless 3.helpful; helpless 4.harmful; harmless 5.meaningful; meaningless 6.powerful; powerless 7.fearful; fearless 8.painful; painless 9.thoughtful; thoughtless 10.speechful; speechless 二、单项选择 1.B 2.C 3.B 4.A 5.B 6.B 7.C 8.B 9.B 10.B 11.B 12.B 13.B 14.B 15.B 三、词形填空 1.careless 2.meaningful 3.harmless 4.helpless 5.hopeful 6.painful 7.powerful 8.fearless 9.meaningless 10.thoughtful 四、句型转换 1.careless 2.without 3.meaningless4.no harm 5.helpless 6.meaningless 7.fear 8.harmless 9.thoughtful 10.power 五、汉译英参考 1.Careless people are easy to make mistakes. 2.Reading is a meaningful activity. 3.Don’t worry. This material is harmless to us. 4.He doesn’t feel helpless when he is in trouble. 5.We are hopeful about the future. 6.Fearless people dare to face the challenges in growing up. 7.Staying up late continuously is harmful to your health. 8.Thoughtful people always consider others’ feelings. 9.Complaining all the time is meaningless. 10.Without knowledge, we feel powerless to change the situation. 2 / 2 学科网（北京）股份有限公司 $