Could you please answer my question? How do you decide to place the word “therefore” in your sentences? My American friend corrected this sentence. Please look the below. --At first, my father-in-law took care of my mother-in-law. It continued for a very long time. Then, about five years ago, my mother-in-law was beginning to lose her abilities. Therefore, she has been living in a nursing care home since then.-- My original sentence is “She therefore has been living….” My English teacher who is a non-native speaker taught me that you should avoid the word "therefore" at the beginning of your sentences. I am confused.