“去過”and “去咗” are different. Below are three dialogues which I hope will help you better understand the difference. Dialogue 1: A: 你去過瑞士未呀？ Nei5 heoi3 gwo3 Seoi6 Si6 mei6 aa3? Have you ever been to Switzerland? B: 從未去過。但係我去過法國。 Cung4 mei6 heoi3 gwo3. Daan6 hai6 ngo5 heoi3 gwo3 Faat3 Gwok3. Never. But I’ve been to France. Dialogue 2: (喺寫字樓) (hai2 se2 zi6 lau4) (In the office) A: 瑪莉喺邊(度)呀？ Maa5 Lei6 hai2 bin1 (dou6) aa3? Where is Mary? B: 佢放緊假，(佢)去咗日本。 Keoi5 fong3 gan2 gaa3, (keoi5) heoi3 zo2 Jat6 Bun2. She’s on holiday. She’s gone to Japan. Dialogue 3: A: 我上個禮拜打電話俾你，不過冇人聽。 Ngo5 soeng6 go3 lai5 baai3 daa2 din6 waa2 bei2 nei5, bat1 gwo3 mou5 jan4 teng1. I phoned you last week, but nobody answered. B: 我唔喺香港，我去咗日本。 Ngo5 m4 hai2 Hoeng1 Gong2, ngo5 heoi3 zo2 Jat6 Bun2. I wasn’t in Hong Kong. I went to Japan. We use the particle “過” after a verb to say that we have experienced doing something in the period of time lasting from the past until now. For instance, 我睇過嗰本書兩次 (I’ve read that book twice.); 我從未打過我隻狗 (I’ve never hit my dog.) We use the particle “咗” after a verb to talk about a completed action in the past. For example, 佢今朝飲咗杯牛奶, 同埋食咗份三文治 (He/she drank a glass of milk and ate a sandwich this morning.) Besides, “咗” is used to talk about a completed activity, the result of which still applies to the present situation. Here is an example. 我唔見咗個銀包 (I’ve lost my wallet.) Hopefully, you’ll find my answer helpful.

去過 means "have been to" 去咗 means "went to" For example, 你有冇去過倫敦？ --- Have you been to London？ 上個禮拜我去咗倫敦。 ----- I went to London last week. Hope it helps :)

very similar. Hope the following dialogue help. A:你有冇去過 London ？ B:有啊，哩個假期，我去咗 London。

去咗 has an implication that it is still present. Therefore, if you say 去咗 London, it implies that the subject is currently still there.