Grammar Info
N3 Lesson 3: 5/23

ばかりだ
(only) continue to, keep on -ing, more and more

ばっかり, ばっか, ばかし, and ばっかし are all fairly common casual variations of ばかり

Structure
Casual
Formal
Verb[る]+ ばかり
Verb[る]+ ばかりで + Phrase
Verb[る]+ ばかりです
Verb[る]+ ばかりで + Phrase
Details
Register Standard
使用域 一般
Information
Occasionally, the 副助詞(ふくじょし) (adverbial particle) ばかり is combined with verbs in their 連体形(れんたいけい) (attributive form), to show that (A) is the only thing that is occuring. It may also imply that (A) is happening ‘more and more’, or that ‘it keeps on (A)’. This phrase utilizes ばかり’s standard meaning of ‘only’, and combines it with the 助動詞(じょどうし) (auxiliary verb) (or です).
  • ガソリン値段(ねだん)は上(あ)がっていくばかりだ
    The price of gas keeps rising.
  • 最近(さいきん)は全然(ぜんぜん)体(からだ)鍛(きた)えていないから、筋肉(きんにく)なくなっていくばかりだ
    Recently I haven't been working out, so I keep on losing muscle.
  • 日本(にほん)人口(じんこう)は減(へ)るばかりです
    Japan's population continues to drop.
  • この辺(へん)は犯罪(はんざい)多(おお)いので、治安(ちあん)悪(わる)くなるばかりです
    Because there are so many crimes around here, the public safety of the area continues to get worse.
As can be seen with these sentences, this use of ばかり is paired almost exclusively with verbs that describe some form of change (higher/lower, stronger/weaker, better/worse, faster/slower, etc).
If the speaker would like to express further information in a (B) part of the sentence, will simply get changed to its 連用形(れんようけい) (conjunctive form) で, before continuing.
  • この町(まち)治安(ちあん)悪(わる)くなるばかりで、しばらく良(よ)くなりそうもない
    The reputation of this town keeps on getting worse, and it doesn't look like it will get better anytime soon.
  • 観光客(かんこうきゃく)減(へ)るばかりで、周(まわり)り店(みせ)潰(つぶ)れていっている
    The amount of tourists keeps on dropping, and the stores around us are closing.
Caution
This use of ばかり is primarily seen with negative trends. However, this is not a grammatical rule, and positive trends may also sometimes appear with ばかりだ.
  • 毎日(まいにち)夜(よる)遅(おそ)くまで働(はたら)いているから、疲(つか)れたまっていくばかりだ
    Because I work until late at night everyday, I keep getting more exhausted.
  • 病院(びょういん)変(か)えてから、体調(たいちょう)良(よ)くなっていくばかりだ
    Ever since I changed hospitals, my health keeps on getting better.
Slow Male
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最近(さいきん)、ビットコインの価値(かち)が下(さ)がっていくばかりだ
Recently, the price of bitcoin keeps on dropping.
Play  
癌(がん)のため、体(からだ)が弱(よわ)っていくばかりです
Because of the cancer, my body continues to get weaker.
Play  
夏休(なつやす)みになってから、日本語(にほんご)を忘(わす)れていくばかりだ
I have been continuously forgetting Japanese since summer vacation started.
Play  
Books
[DBJG] A Dictionary of Basic Japanese Grammar
Page 84
Tae Kim's Japanese Grammar Guide
Page 250