This is the 3856th most frequent Chinese word.
eric
The Chinese word "eric" does not exist; it is likely a name.
Here, 'Eric' is used as a proper noun and refers to the name of a specific individual.
Eric是我的朋友。
Eric is my friend.
In this sentence, 'Eric' again serves as a proper noun and specifies the individual performing the action.
昨天Eric在公园跑步。
Yesterday Eric was running in the park.
'Eric' in this context is the subject of the clause, and its usage demonstrates co-reference with prior mentions of the individual.