"Saya berenang dan dia berenang."
Terjemahan:I swim and she swims.
A : Subject Plural / THEY / WE / I / YOU = NO need for "s".
Ex : They swim. We drink. You try. I do. Etc
Or [Subject + Verb]
B : Subject not Plural / HE / SHE / IT = NEED "s" / "es". Ex: He swims. She drinks. She tries. He does. It breaks. It does. Etc.
Or [Subject + Verb with "s"]