1.

She doesn't live in London because she doesn't know anybody there.

She'd ...

She'd live in London if she knew somebody there.

2.

My travel expenses are low because I live and work in the city centre.

If I ...

If I didn't live and work in the city centre, my travel expenses would be high (higher).

3.

Most people go to work by car because the public transport system is inefficient.

If the public transport system ...

ALTERNATIVE 1: If the public transport system were (more) efficient, few(er) people would go to work by car. ALTERNATIVE 2: If the public transport system weren't (so) inefficient, people wouldn't go to work by car.

4.

The standard of living in the Argentine provinces is low because the government gives them little money.

If the government ...

ALTERNATIVE 1: If the government gave the Argentine provinces more money, the standard of living there would not be so low. ALTERNATIVE 2: If the government gave the Argentine provinces more money, the standard of living there would be higher.

5.

Few people want to live in that part of the city because there is so much crime there.

More ...

ALTERNATIVE 1: More people would want to live in that part of the city if there was not so much crime there. ALTERNATIVE 2: More people would want to live in that part of the city if there was less crime there.

6.

I can't live in the country because I can't find a job there.

I'd ...

I'd live in the country if I could find a job there.