更新时间:作者:小小条
一、核心区别

二、详细用法及例句
(一)call on
1. 核心用法:
表示“拜访某人”,侧重短暂访问;
表示“号召/请求某人做某事”,语气正式,常与“government, people, audience”等集体或个体名词搭配。
2. 句式及时态示例
含义1:拜访某人
一般现在时:主语 + call on + 某人 + 地点状语
She often calls on her grandparents in the countryside on weekends.(她周末常去乡下拜访祖父母。)
一般过去时:主语 + called on + 某人 + 时间状语
I called on my former teacher when I was in Beijing last month.(上个月在北京时,我拜访了以前的老师。)
含义2:号召/请求某人做某事
基本结构:主语 + call on + 某人 + to do sth
The leader called on all citizens to protect the environment.(**号召全体公民保护环境。)
一般将来时:主语 + will call on + 某人 + to do sth
The organization will call on volunteers to help the homeless this winter.(该组织今年冬天将号召志愿者帮助无家可归者。)
宾语从句(间接请求):主语 + call on + 某人 + that 从句(从句用“should + 动词原形”)
Teachers call on parents that they should spend more time with their children.(老师呼吁家长应该多花时间陪伴孩子。)
(二)call for
1. 核心用法:
表示“需要/要求某事物”,强调客观需求;
表示“呼吁某行动”,侧重对集体或社会层面的行动倡议。
2. 句式及时态示例
含义1:需要/要求某事物
一般现在时:主语 + call for + 事物/名词
This difficult problem calls for careful analysis and patience.(这个难题需要仔细分析和耐心。)
现在完成时:主语 + have/has called for + 事物 + 时间状语
The project has called for a lot of financial support since it started.(这个项目自启动以来一直需要大量资金支持。)
含义2:呼吁某行动
基本结构:主语 + call for + 动名词/行动名词
Many experts call for reducing carbon emissions to slow down global warming.(许多专家呼吁减少碳排放以减缓全球变暖。)
一般过去时:主语 + called for + 行动名词 + 从句
The public called for that the local government should improve public transportation.(公众呼吁当地政府改善公共交通。)
被动语态:事物 + be called for by + 主语
Immediate action is called for by the urgent situation.(紧急情况需要立即采取行动。)
三、文字描述
1. call on:分两栏,左栏画“一个人敲门”的简笔画,旁边标“拜访:人→人(访问)”;右栏画“一个演讲者指向人群”的简笔画,下方标“号召:人→人(请求做某事)”。
2. call for:分两栏,左栏画“一个问号指向工具箱”的简笔画,标“需要:事物→所需物品”;右栏画“一群人举着‘环保’标语”的简笔画,标“呼吁:主体→行动/倡议”。
四、练*题及解析
(一)选择题:用“call on”或“call for”填空,必要时调整时态
1. The manager ______ (the employees) to work harder to meet the end-of-year target.
2. This serious accident ______ (a thorough investigation into the safety rules).
3. We ______ (our old neighbor) last Sunday, but she wasn’t at home.
4. The current situation ______ (everyone to stay calm and united).
(二)答案及解析
1. called on(“employees”是人,“to work harder”是请求的动作,用“call on sb to do sth”结构,此处用一般过去时符合语境)。
2. calls for(“accident”需要“调查”这一事物,表客观需求,用“call for + 名词短语”,一般现在时)。
3. called on(“old neighbor”是人,“last Sunday”提示过去时,表“拜访”,用“call on + 人”)。
4. calls for(“situation”呼吁“保持冷静团结”这一行动,虽有“everyone”,但核心是“呼吁行动”,用“call for + sb to do sth”,一般现在时)。
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