Bài 4: Các thì hoàn thành - Perfect tenses

 Ý nghĩa và cách sử dụng thì hoàn thành:

- Công thức và cách dùng thì hiện tại hoàn thành

- So sánh thì hiện tại hoàn thành và thì quá khứ đơn

- So sánh thì hiện tại hoàn thành và thì hiện tại hoàn thành tiếp diễn

Bài 4: PERFECT TENSES

Contents
- Present perfect vs. Past simple
- Present perfect vs. Present perfect continuous

Present perfect
I've been learning English for more than 15 years, and I've been teaching it for 5 years. I've met many types of students. Some of them were nice, but some very naughty. I've also had many problems in my teaching. But overall, I've enjoyed this job and I'm not going to exchange it for anything.
have/has + V3
I've taught English for 5 years.

Present perfect: Use
I've just bought a new laptop.

I've lived here for 6 years (since 2008).

I've (already) finished my homework.

Have you ever been to Paris?

I've never been outside this country.

Present perfect vs. Past simple
- I have lived here for 6 years.
- I lived here for 6 years.
- I came here in 2009.
- I have lived here for 6 years.
- I have finished my homework.
- I finished my homework at 6. 

Present perfect vs. Present perfect continuous
- I've lived here for 6 years.
- I've been living here for 6 years.
- I've taught English for 6 years.
- I've been teaching English for 6 years.
I've been working hard & I've earned quite a lot of money.
I've been talking for the last 3 hours. I'm really tired now.