1. My parents have worked in this factory for over 20 years.

-> Over 20 year ago, my parents began to work in this factory.

-> Over 20 year ago, my parents began working in this factory.

2. He has worked at the factory for 15 years.

-> He started working at the factory 15 years ago.

-> He started to work at the factory 15 years ago.

3. We have learned English for one year .

-> We began to learn English one year ago.

-> We began learning English one year ago.

4.How long is it since they bought the house?

-> When did they buy the house?

5. When did you last see Tom?

-> How long haven't you seen Tom? 

1. My parents have worked in this factory for over 20 years.

-> Over 20 year ago, my parents began to work in this factory.

-> Over 20 year ago, my parents began working in this factory.

2. He has worked at the factory for 15 years.

-> He started working at the factory 15 years ago.

-> He started to work at the factory 15 years ago.

3. We have learned English for one year .

-> We began to learn English one year ago.

-> We began learning English one year ago.

4.How long is it since they bought the house?

-> When did they buy the house?

5. When did you last see Tom?

-> How long haven't you seen Tom?

viết lại câu sao cho nghĩa ko thay đổi :

1. When did you study English? (How long)

How long have you studied english ?

2. They began building this house 2 months ago. (They have)

they have built this house for 2 months.

3.My father started to work in this factory last week. (My father has)

My father has worked in this factory since last week.

4. How long has he worked in the garden? (When)

when did he last work in the garden ?

1. When did you study English? (How long)
=> How long have you studied English?

2. They began building this house 2 months ago. (They have)
=> They have built this house since 2 months

3.My father started to work in this factory last week. (My father has)
=> My father has worked in this factory last week

4. How long has he worked in the garden? (When)
=> When did he work in the garden?

1. We started learning English when we were in grade 3.

=) We ..have learnt English ...........since.. we were in grade 3..............

2. How long is the road ?

=) What ....is the length of the road?...............

3. There is noise pollution. People and animals have hearing problems

=) If.......there isn't noise pollution, ... people and animals  wonn't have hearing problems.......................

we have learned E since we ...

What is the length of the road

If there weren't noise pollution,people and animals wouldn't have...

1. We have lived in here since 2005.

2. How long have you learnt English?

1: We lived here in 2005 -> We.... have lived here since 2005........

2: When did you begin to learn English? -> How long....have you learned English........?

We have lived here since 2005.

How long have you learnt English? 

1. Your book isn't the same as Lan's book.

2. Tom has learnt English since 1990.

sao ko có ai hết vậy

sorry mk mới lớp 5 k giúp bn đc rồi

.When did you start learning English ?
=> How long have you started learning English?

#Học Tốt :>

Cảm ơn bạn 

How long have you started learning English

1. Mrs An didn' t drink coffee when she was young but she s it now.

-Mrs An didn' t use  to drink coffee when she was young.

2. I got up late last year, but now i get up early.

- I used  to get up late last year.

3. Two years ago, my brother often played chess very well but now he doesn't .

- My brother  used to play chess very well two years ago.

4. My father usually played soccer, but now he doesn' t any more .

- My father used  play soccer.

5. When did you begin to study English?

- How long  have you studied English?

6. How long have you studied medicine ?

- When did you begin to studied medicine?

7. When did you start to learn English?

- How long have you learnt English?

8. The last time we ate this kind of food was in January.

- We haven't  eaten this kind of food since January.

9. Hoa has written to me since she moved to London.

- Hoa started  to write to me since she moved to London.

~~Good luck~~

\(\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)...\left(1-\frac{1}{2012}\right)\)

\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.\frac{4}{5}...\frac{2010}{2011}.\frac{2011}{2012}\)

\(=\frac{1.2.3.4...2010.2011}{2.3.4.5...2011.2012}\)

=\(=\frac{1}{2012}\)

1 , We haven't seen her since Christmas day

2 , This is the fisrt time I have eaten this kind of food

3 , It has rained for an hour

4 , The last time I visited my grandfather was two months ago

5 , I began studying EL three years ago

6 , It's five years since my brother saw his bestfriend

7 , How long did you start learning EL ?

8 , We have lived here for fifteen years

9 , She hasn't visted me for five years

10 , I haven't written to my uncle since July

11 , We have not become close friend for long time

12 , Minh has collected stamp since 2000

1. We haven't seen her was on Christmast day

2. This is the first time I have eaten this kind of food.

3.It has rained for an hour.

4. The last time we visited my grandparents for two - month.

5. I began studying English three years ago.

6.  It’s nearly five years since my brother saw his best friend.

7. How long have you learnt English?

8.We have lived here for fifteen years.

9. She hasn’t visited me for five years.

10. I haven't writen to my uncle since July.

11. We have become close friend for a long time.

12. Minh has collected stamps since 2000.