What's the difference between V-てばかりいる and V-てばかりだ?. I came across these sentences and they seem to have all the same meaning "always/only be doing something", but their usage and constructions appear to be different:
"幸子ちゃんは、毎日食べてばかりです。"
"幸子ちゃんは、遊んでばかりいます。"
"幸子ちゃんは、泣いてばかりいて、何も話そうとしない。"
The only difference that I think might be worth mentioning is that:
「～～てばかり+ いる/います」
sounds slightly more formal and/or objectively observed than:
「～～てばかり + だ/です」
which could tend to sound slightly more subjectively observed, emotional, exclamatory, etc.
The difference would mostly be minimal unless these phrases are qualified by other words used in the context.
