cái này đúng ko cô:))
(a + b)² = a² + 2ab + b²
(a – b)² = a² – 2ab + b²
a² – b² = (a – b)(a + b)
(a + b)³ = a³ + 3a²b + 3ab² + b³
(a – b)³ = a³ – 3a²b + 3ab² – b³
a³ + b³ = (a + b)(a² – ab + b²)
a³ – b³ = (a – b)(a² + ab + b²)
1. Present Simple (Hiện tại đơn)
👉 S + V(s/es)
Ví dụ: She plays piano.
2. Present Continuous (Hiện tại tiếp diễn)
👉 S + am/is/are + V-ing
Ví dụ: I am studying now.
3. Present Perfect (Hiện tại hoàn thành)
👉 S + have/has + V³
Ví dụ: They have finished homework.
4. Present Perfect Continuous (HTHT tiếp diễn)
👉 S + have/has + been + V-ing
Ví dụ: She has been working for 2 hours.
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5. Past Simple (Quá khứ đơn)
👉 S + V²/ed
Ví dụ: He watched TV yesterday.
6. Past Continuous (Quá khứ tiếp diễn)
👉 S + was/were + V-ing
Ví dụ: I was sleeping at 10pm.
7. Past Perfect (Quá khứ hoàn thành)
👉 S + had + V³
Ví dụ: They had left before I arrived.
8. Past Perfect Continuous (QKHT tiếp diễn)
👉 S + had + been + V-ing
Ví dụ: She had been reading for 3 hours.
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9. Future Simple (Tương lai đơn)
👉 S + will + V
Ví dụ: I will call you tomorrow.
10. Future Continuous (Tương lai tiếp diễn)
👉 S + will + be + V-ing
Ví dụ: This time tomorrow, I will be traveling.
11. Future Perfect (Tương lai hoàn thành)
👉 S + will + have + V³
Ví dụ: By 2026, I will have graduated.
12. Future Perfect Continuous (TLHT tiếp diễn)
👉 S + will + have + been + V-ing
Ví dụ: Next month, she will have been working here for 5 years.