It's necessary for sb to do sth-2025-2026学年九年级英语全一册句型辨析（北师大版）

九年级全一册北师大版 【句型精讲】 C版句型辨析 核心句型 【C版句型辨析】It's necessary for sb to do sth结构精讲 初中英语·北师大版九年级全一册 句型辨析精讲 -It's necessary for sb to do sth vs It's important for sb to do sth 维度 It's necessary for sb to do sth It's important for sb to do sth 核心含义强调客观上”有必要、必须做强调主观上”某事具有重要 某事” 性” 语气程度语气较强，含”必须、不得不” 语气相对较弱，侧重”重要但 的意味 非必须 使用场景 侧重表达义务、责任或逻辑上侧重表达事物的价值或意义 的必要性 例句对比 It's necessary for students to follow school rules.(遵守校规是学生必须做的) It's important for students to learn English well.(学好英语对学生很重要) 真题链接（北师大版九年级上册期中真题） It's for us to protect the environment.We can't live without clean air and water. A.necessary B.important C.interesting 答案：A解析：后句强调没有清洁的空气和水我们无法生存，说明保护环境是”必须的”，用 necessary,选A。 九年级全一册北师大版 【句型精讲】C版句型辨析 辨析二It's necessary for sb to do sth vs Sb need to do sth 维度 It's necessary for sb to do sth Sb need to do sth 句子结构 形式主语t开头，真正主语是 人作主语，直接接不定式作谓 不定式 语 语气侧重 强调客观情况的必要性 强调主语自身的需求或必要 时态变化仅通过be动词变化时态 need可根据主语和时态变化 (needs/needed) 例句对比 It's necessary for him to finish the work today.(客观要求今天必须完成) He needs to finish the work today.(他自己需要今天完成) 真题链接（北师大版九年级全一册同步练习） -Why does she stay up late? It's necessary for her the report before tomorrow. A.finish B.to finish C.finishing 答案：B解析：t's necessary for sb to do sth为固定句型，不定式作真正主语，选B。 辨析三t's necessary for sb to do sth vs It's necessary that.. 维度 It's necessary for sb to do sth It's necessary that... 句式特点不定式作真正主语，b是不 hat引导主语从句，从句常用 定式逻辑主语 虚拟语气(should+动词原形) 适用语境 侧重动作的执行者明确 侧重表述某件事的必要性，执 行者可省略或在从句中体现 例句对比 It's necessary for us to prepare for the exam.(我们有必要准备考试) It's necessary that we(should)prepare for the exam.(准备考试是有必要的) 真题链接（北师大版九年级下册期末真题） 九年级全一册北师大版 【句型精讲】C版句型辨析 It's necessary we should learn to work with others. A.that B.for C.of 答案：A解析：句中we should learn.是完整从句，用It's necessary that..结构，选A。 辨析四t's necessary for sb to do sth vs It's required for sb to do sth 维度 It's necessary for sb to do sth It's required for sb to do sth 语义侧重强调逻辑或客观上的”必要强调”按规定、要求必须做某 性” 事” 来源性质必要性来自事物本身或常识 必要性来自外部规则、规定或 权威要求 例句对比 It's necessary for plants to get enough sunlight..(植物需要阳光是客观必要) It's required for all students to wear uniforms at school..(穿校服是学校的规定要求) 真题链接（北师大版九年级上册月考真题） It'sfor passengers to show their ID cards before getting on the train.It's a rule ofthe railway station A.necessary B.required C.possible 答案：B解析：后句说明'这是火车站的规定”，强调外部要求，用required,.选B。 综合训练 1.It's for children to drink milk every day.It helps them grow strong bones. A.necessary B.important C.interesting 3 九年级全一册北师大版 【句型精讲】C版句型辨析 2.-Why does Tom study so hard these days? -It's necessary for him the final exam next month. A.pass B.to pass C.passing 3.It's necessary we should keep quiet in the library. A.that B.for C.of 4.It's for all passengers to go through security checks before boarding the plane.It's an airport rule. A.necessary B.required C.possible 1.It's (for us to learn basic life skills like cooking and cleaning 2._(对学生来说有必要)to finish their homework on time. 3.It's necessary that we_(应该帮助)each other when in trouble. 1.We need to wear masks in crowded places.It's necessary for sb to do sth) 2.It's necessary for her to practice English every morning.(改为Sb need to do sth结构) 3.It's necessary that students should follow the classroom rules.It's necessary for sb to do sth 构 L单项选择 1.A2.B3.A4.B Ⅱ.完成句子 1.necessary 2.It's necessary for students 3.(should)help L.句型转换 1.It's necessary for us to wear masks in crowded places. 九年级全一册北师大版 【句型精讲】C版句型辨析 2.She needs to practice English every morning. 3.It's necessary for students to follow the classroom rules. 5