Here's what we know:
* Squanto was captured and taken to England: He was kidnapped by English explorers around 1614 and spent a few years in England.
* He learned English while in England: During this time, he learned the English language, likely from various people he encountered.
* He returned to the Americas: Squanto returned to his homeland in 1619, only to find his tribe had been decimated by disease.
* He became an intermediary: He then played a crucial role as an intermediary between the English settlers and the Wampanoag tribe, acting as an interpreter and cultural broker.
While we don't know the specific person(s) who taught Squanto English, it's likely he learned from a variety of English individuals during his time in England.