1,Ba hasn't met his old teacher for 2 years

-->It is 

2,He hasn't written to him for two months

-->That last time

3,He began watching a soccer match on TV twenty Minutes ago

-->He has

4,when did you first know this bamboo forest 

--> How long

1,I last wrote to you a month ago

-->I haven't

2,The last time I saw Tony was in 1986

-->I haven't

3,It's nearly 20 years since my father met her

-->My father hasn't

4,He last saw her two weeks ago

-->He hasn't 

5,The last time she went out with him was 9 months ago

--->SHE hasn't

6,It's two months since I was last in Ha Noi

--->I haven't

I'm sorry that I sing very badly

-->I wish

What a pity I am not here with them now

-->I wish

We Will not have leisurely bicycle rides next week

-->We wish

I live very far from school

-->I wish

bài 3:Một bể nước có 200 lít nước .người ta cho 1 vòi chảy vào bể mỗi phút vòi chảy được 25 lít .

a)sau mỗi phút lượng nước trong bể là y lít,lập hàm số biểu thị quan hệ giữa y và x

b)vẽ đồ thị hàm số biết rằng dung tích của bể là 1200 lít