ばかり

Particle: ばかり
Function: Approximate amount or exclusive focus
Level: N3
How it works: Attaches to nouns or verbs to indicate doing only one thing, or to show an approximate amount.
Example: Kare wa neteばかり iru. He is just sleeping all the time.
Versus: だけ (dake) limits quantity strictly, whereas ばかり (bakari) can also express doing something excessively or an approximate amount.