Change the following sentences from the active into passive

I,Change the following sentences from the active into passive
We are going to grow flowers in the front garden.
II, Rewrite the following sentences so that the second sentence means nearly exactly the same as the first one :
1. We have learnt English for 4 years.
We started ...
2. My farther started to give up smoking last year.
My father has ....
3, Lan hasn't written to Maryam for amonth.
Lan didn't ...
4. When did you start to listen to lcassical music ?
How long ... ?
5, I last saw her 10 years ago.
I haven't
6, How long have you bought this car ?
When did