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since September. 4. She has been studying English for three years. $$ She started studying English three years ago. 5. They have lived in this city since 2010. $$ They moved to this city in 2010 and have been living here since then. 6. He hasn't seen his parents for a long time. $$ He last saw his parents a long time ago. 7. I have known her since we were in high school. $$ I have known her since our high school days. 8. We have been waiting for the bus for half an hour. $$ We started waiting for the bus half an hour ago. 9. They haven't finished their homework yet. $$ They still haven't finished their homework. 10. She has been working at the company for five years. $$ She started working at the company five years ago.