我去了游泳怎么说英语

To say "I went swimming" in English, you can simply say "I went to the pool/beach/lake/etc. to swim." For example:
"I went swimming at the local pool this morning."
"I took a dip in the ocean while I was on vacation."
"I went swimming in the lake with my friends yesterday."
You can also use the past tense verb "swam" to say that you went swimming in the past. For example:
"I swam at the pool this morning."
"I swam in the ocean while I was on vacation."
"I swam in the lake with my friends yesterday."