他不去游泳英文可以译作 "He is not going swimming."
来源：这是一个基本的英语句子，表示一个人不打算去游泳。
英文例句：
"I asked him if he wanted to go swimming with me, but he said he was not going swimming today."
中文翻译：我问他是否想和我一起游泳，但他说今天他不去游泳。
"I was hoping to go swimming at the beach this weekend, but my friend said he was not going swimming because he didn't have a swimsuit."
中文翻译：我本来希望这个周末去海滩游泳，但我的朋友说他不去游泳，因为他没有泳衣。
"My pttle brother loves to go swimming, but my sister said she was not going swimming because the water was too cold."
中文翻译：我的弟弟喜欢游泳，但我的姐姐说她不去游泳，因为水太冷了。