II. Chia động từ ở thì hiện tại hoàn thành và quá khứ đơn
1) The police.........two people early this morning. (to arrest)
2) She.........to Japan but now she.........back. (to go - to come)
3) Dan.........two tablets this year. (already/to buy)
4) How many games.........so far this season? (your team/to win)

5).........the CN Tower when you.........in Toronto? (you/to visit - to stay)

6).........your homework yet? – Yes, I.........it an hour ago. (you/to do - to finish)
7) There.........an accident in High Street, so we have to use King Street to get to your school. (to be)
8) I.........Peter since I.........last Tuesday. (not/to see - to arrive)
9) Frank.........his bike last May. So he.........it for 4 months. (to get - to have)
10) I'm sorry, I.........earlier, but I.........a lot lately. (not/to write - to work)

1 arrested 

2 went - has come

3 has already bought

4 has your team won

5 Did you visit - stayed

6 Have you done - finished

7 was

8 hasn't seen - arrived

9 got - has had

10 didn't write - have worked 

----------

* Quá khứ đơn

- Với tobe

(+) S + was/were

(-) S + was/were + not

(?) (Wh) + Was/Were + S?

- Với động từ thường

(+) S + V2/ed

(-) S + didn't + V

(?) (Wh) + Did + S + V?

-> Dấu hiệu: yesterday, this morning, last + mốc thời gian, khoảng thời gian + ago, in + năm trong quá khứ,...  

- He, she, it, N số ít + was

- You, we, they, N số nhiều + were

- I + was trong câu khẳng định và phủ định, + were trong câu nghi vấn 

* Hiện tại hoàn thành

(+) S + have/has + V3/ed

(-) S + have/has + not + V3/ed

(?) (Wh) + Have/Has + S + V3/ed?

-> Dấu hiệu: already, recently, lately, just, yet, for + khoảng thời gian, since + mốc thời gian, once, twice, three times,... 

- I, you, we, they, N số nhiều + have

- He, she, it, N số ít + has