主语 should 动词原形-2025-2026学年七年级英语下册句型辨析（北师大版）

初一下册北师大版 【句型精讲】 should用法辨析 核心句型 【句型辨析】主语+should+动词原形精讲 初中英语·北师大版初一下册 句型辨析精讲 辨析一should+动词原形vs had better+动词原形 维度 should+动词原形 had better+动词原形 语气强度建议性，语气较委婉 劝告性，语气更强烈（含”最 好”否则可能有不良后果”意 味) 否定形式should not(shouldn't)+动词原 had better not+动词原形 形 适用场景日常建议、义务、责任等 针对具体情况给出的警告或 强烈建议 例句对比 You should brush your teeth twice a day.（日常习惯建议，语气委婉) You had better take an umbrella;it's going to rain.(具体情况警告，语气强烈) 真题链接（北师大版初一下册期中真题） -It's cold outside.Youwear a warm coat. A.should B.had better not C.shouldn't 答案：A解析：天冷建议穿外套，语气委婉，用should:B、C均为否定，与语境不符。 初一下册北师大版 【句型精讲】 should用法辨析 辨析二should+动词原形vs must+动词原形 维度 should+动词原形 must+动词原形 语气强制力 非强制性，表”应该”（可接受 强制性，表”必须”（强调义务 不执行) 或命令，不执行可能有后果) 否定含义 shouldn't表”不应该，（劝阻） mustn't表”禁止”（绝对不允 许) 适用场景 建议、情理上的应该 法律、规定、命令或强烈必要 例句对比 You should say sorry to her.(建议，情理上应该) You must wear a seat belt when driving.(法律规定，必须执行) 真题链接（北师大版初一下册同步练习） I finish my homework now? -No,you needn't.But you finish it before dinner. A.Must;should B.Should;must C.Must;must 答案：A解析：第一空回答用needn't,对应问句must; 第二空表”应该在晚饭前完成”，语气非 强制，用should。 辨析三should+动词原形vs be supposed to+动词原形 维度 should+动词原形 be supposed to+动词原形 含义来源 基于个人判断或普遍道理的基于规则、约定或他人期望的， 建议 理应如此” 否定形式 shouldn't do be not supposed to do 实际执行暗示 仅表建议，不暗示是否已执行常暗示”本应做但可能未做” (口语中) 例句对比 We should help each other.(基于道理的建议) You are supposed to arrive on time for class.(基于规则的要求，可能暗示”你可能迟到了，) 真题链接（北师大版初一下册期末真题） 初一下册北师大版 【句型精讲】 should用法辨析 The sign says"No parking".Youpark your car here. A.shouldn't B.aren't supposed to C.must 答案：B解析：标志提示”禁止停车”，表基于规则的”不应该”，be supposed to更贴合”按规定理 应不做”：A语气较弱，C为肯定，均不符。 辨析四should+动词原形vs can+动词原形 维度 should+动词原形 can+动词原形 核心功能 表”应该（建议、义务) 表”能力，许可”或”可能性” 语气侧重点强调正确性”或”必要性” 强调”可行性”或权限 例句对比 You should study harder for the exam.(建议的必要性) You can study in the library.(许可或可能性) 真题链接（北师大版初一下册月考真题） I use your dictionary? -Yes,you can.But youreturn it to me tomorrow. A.Can;should B.Should;can C.Must:should 答案：A解析：第一空表请求许可，用can:第二空表”应该明天归还”，用should表建议性义务。 综合训练 1.You keep quiet in the library.It's a rule for everyone. A.should B.mustn't C.can 3 初一下册北师大版 【句型精讲】 should用法辨析 2. I bring my mobile phone to the exam? -No,you.It's not allowed. A.Can;mustn't B.Should;needn't C.Must;shouldn't 3.The sign says"No smoking".You smoke here. A.should B.aren't supposed to C.must 从should/had better/must/be supposed to中选择合适的词填空 1.You take some medicine;you have a high fever. 2.We respect our parents and teachers.It's a traditional virtue. 3.You not be late for school.The teacher will be angry. 4.If you want to pass the exam,you study hard from now on. l.You should finish your homework before watching TV.(改为否定句) 2.We are supposed to arrive at the station at8:00.(改为一般疑问句) 3.You mustn't park your car here..(改为同义句，用be supposed to) L.一、单项选择 1.A2.A3.B Ⅱ.二、选短语填空/完成句子 1.had better 2.should 3.are supposed to 4.must 4 初一下册北师大版 【句型精讲】 should用法辨析 ⅡI三、句型转换 1.You shouldn't finish your homework before watching TV. 2.Are we supposed to arrive at the station at 8:00? 3.You aren't supposed to park your car here. 5