... I've been reading this book since 10 this morning. Từ thường đi kèm : for (with a period of time), since (with an exact point in time), ever, never, yet, already, this week (month, year)Cấu ... mountain.Những hành động chưa kết thúc(hành động vẫn đang diễn ra).He's lived in San Francisco for 10 years.How long have you worked for this company?They've studied English for ... working for this company for 5 yearsPhủ định Chủ ngữ + have/has + not (haven't/hasn’t) + been + verb + ing I, You, He, She, We, They haven't/hasn’t (have not/ has not) been studying for...