I could always do with the money.

（お金が必要でね。）
　BBCドラマ「シャーロック」エピソード2 "The Blind Banker" より。職探し中のワトスンは代診医の面接へ。あなたのようなちゃんとした経歴を持つ方に、こんな簡単な仕事はどうかしら、と言われ、こう答える。

• "can(could)+do with〜"という形で「〜が必要だ／〜があるとありがたい」という意味に。（to be helped by having (something)／to need or want something／to want or need someone or something; to benefit from someone or something／used to say that you need or would like to have something／want something very much）
  • I could do with a cup of hot coffee right now!
  • I could do with a little less criticism right now, if you don't mind!
  • I could have done with some help this morning.
  • She could do with a night's sleep.
  • I could do with a nice cool drink right now.
  • I could do with some help on this project.
  • You look as if you could do with a haircut.
  • Her hair could have done with a wash.
  • I could do with a rest.
• withをwithoutにして（could do without〜）「〜が不要である、欲しくない、〜にイライラする」という意味で使う時もある。
  • I can do without your complaints first thing in the morning.
  • You can do without all that hassle.
  • Those are the type of stupid remarks I can do without.