How do you say been in Pinyin?

"Been" in the past participle sense (like "I have been to the store") is translated to 已经 (yǐjīng) in Pinyin.

It's important to note that "been" can also mean "being" in some contexts. In those cases, you'd need to use the appropriate verb for the situation. For example, "I have been working" would be "我一直在工作" (wǒ yīzhí zài gōngzuò).