1. We started learning English in 2006
2. Nhi got good grades in her exam because she worked very hard .
3. I can't talk to foreigners because I don't understand what they say
4. They will have a test tomorrow
5. Because the weather was cold, they had to cancel their picnic
6. When did you buy the car
7. They arrived here a week ago
8. I'm sorry I don't know her address
9. The last time I visited my uncle was last summer vacation
10. They moved to this town last year because they needed to do a new business job
11. He often has a cup on a trip to the countrysi

=>1.We started learning English in 2006=> we have learnt English since 2006.
Nhi got good grades in her exam because she worked very hard .
=> Nhi was so hard-working that Nhi got good grades in her exam.
I can't talk to foreigners because I don't understand what they say.
=>I don't understand what they say so I can't talk to foreigners
They will have a test tomorrow
=> A test will be had tomorrow.
Because the weather was cold, they had to cancel their picnic
=> If the weather had  been cold, they would have cancelled their pinic(tỉnh lược từ not ổ hai vế)
When did you buy the car?=> HOw long is it since you bought the car?
They arrived here a week ago=> They have arrived here for a week.
I'm sorry I don't know her address=> I wish I knew her address.
The last time I visited my uncle was last summer vacation
=> I have not visited my uncle since last summer vacation.
They moved to this town last year because they needed to do a new business job
=> They needed to do a new business job sothat they moved to this town last year
He often has a cup on a trip to the countryside
=> A cup is often had  on a trip to the countryside.