by 通过某种方式He improved his English by listening to BBC news.in 在…方面/在…过程中She succeeded in working out the problem.on 关于/一…就 He went to school on having breakfast.at 在…方面 She is good at playing the piano.for 因为/为了 Thank you for giving me so much help.after 在…之后 After finishing homework, he played basketball.before 在…之前 Think twice before making a decision.without 没有/不做… He left without saying a word.about 关于 How about going for a walk after dinner?of …的 I’m fond of reading novels in my free time.with 带有/伴随 She sat there with tears running down her face.
2. 中考必考固定搭配（介词隐藏在短语里）
这是最容易丢分的陷阱：介词藏在固定短语里，很多同学看不到，直接填原形。✅ 必背高频短语：be good at doing 擅长做某事be interested in doing 对做某事感兴趣be busy doing 忙于做某事be tired of doing 厌倦做某事be afraid of doing 害怕做某事be proud of doing 为做某事而骄傲spend time (in) doing 花费时间做某事have difficulty/trouble (in) doing 做某事有困难have fun (in) doing 做某事很开心give up doing 放弃做某事put off doing 推迟做某事look forward to doing 期待做某事pay attention to doing 注意做某事stick to doing 坚持做某事be used to doing 习惯于做某事⚠️ 中考超级易错点：以上短语里的 to 是介词，不是不定式符号，后面必须加doing！最常考：look forward to, pay attention to, be used to, stick to
3. 特殊说明
只有 to 作不定式符号时，才加动词原形。初中阶段90%带to的短语都是不定式，只有上面列出的几个to是介词，单独记忆即可。
三、解题步骤（考场直接用）
扫空格前后，看到介词/含介词的固定短语，立刻触发公式
确认括号内给出的是动词
直接变doing形式，注意双写、去e等变形规则
回读句子，确认语义通顺
四、真题演练
要求：根据句意，用括号内所给单词的适当形式填空。1.We can save water by ________ (fix) the leaking taps.（2024·河北中考改编）2.She is looking forward to ________ (visit) the Great Wall this summer.（2024·广东中考改编）3.Before ________ (go) to bed, you should drink a glass of milk.（2023·江苏苏州改编）4.He has difficulty in ________ (communicate) with others in English.（2023·浙江杭州改编）5.Without ________ (work) hard, you can’t pass the exam.（2024·四川成都改编）6.Thank you for ________ (invite) me to your birthday party.（2023·湖北武汉改编）7.My grandpa is used to ________ (walk) in the park after supper.（2024·河南中考改编）8.He gave up ________ (smoke) last year and became healthier.（2023·山东济南改编）9.How about ________ (go) swimming with us this afternoon?（2024·安徽中考改编）10.She is interested in ________ (read) science fiction novels.（2023·湖南长沙改编）11.They spent two hours ________ (decorate) the classroom yesterday.（2024·福建中考改编）12.Please pay attention to ________ (take) notes while listening.（2023·陕西中考改编）13.After ________ (graduate) from college, he went to work in Tibet.（2024·云南中考改编）14.Stick to ________ (practice) every day, and your piano skills will improve.（2023·辽宁沈阳改编）15.He sat there without ________ (say) a word, looking very sad.（2024·江西中考改编）
如果有用，欢迎收藏、转发有需要的人，如需电子版，后台回复:语法填空
参考答案+精准解析
1.fixing解析：by是介词，后面接动名词；fix直接加ing。2.visiting解析：look forward to 中to是介词，后面接动名词，中考高频易错点。3.going解析：before是介词，后面接动名词。4.communicating解析：have difficulty in doing sth. 固定搭配，in是介词。5.working解析：without是介词，后面接动名词。6.inviting解析：thank you for doing sth. 固定搭配，for是介词。7.walking解析：be used to doing 习惯于做某事，to是介词，易错点。8.smoking解析：give up doing sth. 固定搭配，up是介词。9.going解析：how about doing sth. 提建议句型，about是介词。10.reading解析：be interested in doing sth. 固定搭配，in是介词。11.decorating解析：spend time (in) doing sth. 固定搭配，省略了in，后面接动名词。12.taking解析：pay attention to 中to是介词，后面接动名词。13.graduating解析：after是介词，后面接动名词。14.practicing解析：stick to doing 坚持做某事，to是介词。15.saying解析：without是介词，后面接动名词。
