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How do you express sympathy to a coworker after a death? - sympathy phrases

Hello!

I need help, I'm not good to express my feelings verbally. My friend's mother died this week. We are working instead of in the same department stores and talk, but not really personal conversations. I feel like an idiot and am trying my colleagues because I do not know what to say or how to deal with this situation because it has never happened before, to avoid ... Yes, I know it is really stupid. How can I express my solidarity with my colleagues? What do I have to say that at least I can recognize them? Has anyone every sentence be? I feel like an idiot! Thank you for your answers.