"The teacher's home is in Hong Kong."
You should not always learn things from one source. I'm not saying Duolingo isn't a good platform, but it is definitely beneficial to use other sources. You can try tapping on the words, which helps certain character translations, but studying sentence structure helps you put it in a sentence. A good acronym is St. Plavo S - Subject T - Time Pl- Place A- Adverb V- Verb O- Object Also note that in Chinese, things are listed from greatest to lowest value. For example, to write the date, you first write the year, then the month, and then the day.