Indefinite nouns, مَنْ and مَا: linking without اَلَّذِي in Arabic

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• Which sentence means “I have a friend who speaks Spanish”?
• Which phrase means “the friend who speaks Spanish”?
• What does لَا أَفْهَمُ مَا تَقُولُ mean?
• What does أَعْرِفُ مَنْ كَتَبَ هٰذِهِ الرِّسَالَةَ mean?
• Complete, to say “This is what I want”: هٰذَا ___ أُرِيدُ.
• I don’t know who lives here. Complete: لَا أَعْرِفُ [____] يَسْكُنُ هُنَا.
• Tell me what you saw. Complete: قُلْ لِي [____] رَأَيْتَ.
• After an indefinite noun such as رَجُلٌ, you do not use اَلَّذِي.