英语中委婉表达“我今天上午不去游泳了”可以采用以下几种方式：
使用礼貌的语气和理由
- “I’m afraid I won’t be able to swim this morning. I have some unexpected business to attend to.”
- “I’m sorry, but I won’t be able to make it to the pool this morning. I have a prior engagement.”
提出替代方案
- “I’m not going swimming this morning, but perhaps we can reschedule for another time?”
- “I’m skipping the swim this morning, but I’d love to join you later in the week if that works for everyone.”
使用间接的表达方式
- “I’m thinking I might not be able to make it to the pool this morning.”
- “This morning doesn’t look like it’s going to work out for swimming.”
强调个人原因，而非客观限制
- “I’m not feeling up to swimming this morning.”
- “I’ve changed my plans for this morning and won’t be able to swim.”
结合感谢和歉意
- “Thank you for the invitation, but I won’t be able to join you for swimming this morning. I’m sorry for any inconvenience this may cause.”
- “I’m sorry to let you down, but I’m not going to be able to swim this morning. I hope you understand.”
每种方式都根据具体情况和与说话人的关系来选择，以确保沟通的得体和友好。