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When I visited Japan, I met very kind customs guard. This is my first time to visit a foreign country. So I felt really nervous before visiting. However, I arrived at Osaka International Airport, Japanese customs guard smiled at my daughter. Also they spoke her in Korean. They always smiled and they were very kind. I can't forget them. However, when I visited HongKong, I met unkind customs guard. I was lost at HongKong airport, I asked them help me but they didn't help and they didn't answer. So I don't want to visit there again.

Hello [이름]!   You did a great job. Some reminders: We use \'when\' to talk about situations or actions that occur simultaneously. We use when as a conjunction meaning ‘at the time that’. The clause with when is a subordinate clause (sc) and needs a main clause (mc) to complete its meaning. If the when-clause comes before the main clause, we use a comma.   Teacher Venus^^   When I visited Japan, I met very kind customs guard. >>>When I visited Japan, I met very kind customs guards. This is my first time to visit a foreign country. >>>CORRECT So I felt really nervous before visiting. >>>CORRECT However, I arrived at Osaka International Airport, Japanese customs guard smiled at my daughter.>>>However, when I arrived at Osaka International Airport, Japanese customs guards smiled at my daughter.   Also they spoke her in Korean.>>>Also they spoke to her in Korean.   They always smiled and they were very kind.>>>CORRECT   I can\'t forget them.>>>CORRECT   However, when I visited HongKong, I met unkind customs guard.>>>However, when I visited Hong Kong, I met unkind customs guards.   I was lost at HongKong airport, I asked them help me but they didn\'t help and they didn\'t answer.>>>When I was lost at Hong Kong airport, I asked them to help me but they didn\'t help and they didn\'t answer.   So I don\'t want to visit there again. >>>CORRECT