〜てばかりいる／〜ばかりで
Doing nothing but, constantly (critical)machine translation
FormationVerb て-form + ばかりいる；verb plain form + ばかりで、〜ない
Verb て-form + ばかりいる depicts a person repeating one single activity over and over, with the speaker's disapproving gaze attached: 弟はゲームをしてばかりいる (my little brother does nothing but play games). The reproachful nuance is the soul of this pattern — using it for something good, like 勉強してばかりいる, sounds off.
The variant 〜ばかりで、〜ない combines "only… and not…": 彼は口で言うばかりで、何もしない (he's all talk and does nothing). The negative second clause is where this construction differs from てばかりいる.
When advising someone not to stay sunk in one state, use the form 〜てばかりいないで: 泣いてばかりいないで、どうするか考えよう (stop just crying and think about what to do). Note that when the position of ばかり changes, the meaning changes: パンばかり食べている (eating nothing but bread — picky about what to eat) differs from 食べてばかりいる (eating all the time — doing nothing but eating). And ばかりか is a different pattern entirely: "not only… but also."
Examples
弟は毎日ゲームをしてばかりいます。
My little brother does nothing but play games every day.
彼は口で言うばかりで、何もしません。
He's all talk and doesn't do anything at all.
泣いてばかりいないで、どうするか考えましょう。
Stop just crying — let's think about what to do.