Ex11:Find one mistake in each sentence and correct it. 1.I have lived in Ho Chi Minh city since twenty five years. 2.They haven't saw such a terrble fire before 3.The house was cleaned up since we left for Nha Trang 4.The International Olympic Games continued without interrupt since 1986 5.We didn't try hard enough since the second semester 6.I have known this singer since she has been 16 year old. 7.People enjoyed Beethovan's music for nearly 200 years. 8.The boy played soccer since 2 o'clock Giúp mk nha,hứa cho 5 sao