No preposition where English has one: chờ ai, nghe nhạc

Many English verbs need a small word such as "for", "to" or "at" before the thing they're about: "wait for", "listen to", "look at". In Vietnamese, these verbs take the thing straight after them, with nothing in between: chờ em (wait for me), nghe nhạc (listen to music), nhìn tôi (look at me), tìm chìa khóa (look for the keys).

Some common ones: chờ or đợi (wait for), nghe (listen to), nhìn (look at), tìm (look for), trả lời (reply to), nhớ (miss; it also means "remember"), sợ (be afraid of) and tốt nghiệp (graduate from): tốt nghiệp đại học. A price needs no "for" either: Em mua cái áo này hai trăm ngàn. I bought this shirt for two hundred thousand (in Hà Nội, nghìn).

So don't translate the English small word. In particular, cho isn't the "for" in "wait for": it means "for someone's benefit", as in mua cho mẹ (buy for Mum).

Some verbs do take a small word, though. A few take với before the person, such as nói với (say to, tell) and làm quen với (get to know). That's a separate pattern.