Cấu trúc: S + have/has + V3 (past participle) + O I have finished my homework. She has already eaten breakfast. Have vs Has: HAS: cho he/she/it HAVE: cho I/you/we/they I have read this book. She has visited Hanoi. Dấu hiệu nhận biết: already, yet, just, recently since + mốc thời gian for + khoảng thời gian this morning/week (chưa kết thúc) never, ever, once, twice