The oral class

I had three oral classes in the morning. My oral teacher, Chad, who taught us some in common use prepositions today. He thought that a lot of people used prepositions in the wrong way. For example, my left arrives “on Taipei late in night”—actually it should use “in Taipei late at night”. It was a typical mistake that many Taiwanese made. They did not understand how to use the prepositions “in, on, at” correctly and neither do I. I thought that not only writing but also speaking in an essay or a dialogue with the right prepositions was difficult to me. I was confused by the prepositions because they sometimes looked similar usage.