愉快な仲間ばかりで頼もしいぜ
I can not understand the ばかりで in this sentence. Are ばかり and で stand together or both of them stand alone?
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Sign up to join this communityばかり is a particle, so ばかり and で stand alone in the sense that it is not a form of ばかりだ (there is no such na-adjective).
だ is the standard auxiliary verb for assertion and is transformed into its 連用形=で. The construction is called 連用中止. See this question for example. So the sentence means the above two sentence combined with and.