Thomas Edison is famous because he invented the electric light bulb.	If Edison hadn't invented the electric light bulb,  he wouldn't be famous.	
Bill Gates is very rich. He founded one of the most successful software companies.	If Bill Gates hadn't founded one of the most successful software companies, he wouldn't be so rich.	
Warren Buffet has made a lot of money because he is good at picking stocks.	If Warren Buffet wasn't so good at picking stocks, he wouldn't have made so much money.	
J K Rowling is famous because she wrote the Harry Potter books.	If J K Rowling hadn't written the Harry Potter books, she wouldn't be famous.	
Lots of people try to climb Mt Everest because it is the highest mountain in the world.	If Mt Everest wasn't the highest mountain in the world, lots of people wouldn't try to climb it.	
Pollution is bad in Hong Kong because there are so many motor vehicles.	If there weren't so many motor vehicles in Hong Kong, pollution wouldn't be so bad.	
A lot of people died in the 2006 tsunami because there was no warning system.	If there had been a warning system, fewer people would have died.	
Prices have gone up partly because the US dollar is weak.	If the US dollar wasn't so weak, prices might not have gone up so much.	
I got a terrible cold after I went swimming in December.	If you hadn't gone swimming in December, you might not have got a terrible cold.	
Lucy and Tom split up because Lucy had an affair with another man.	If Lucy hadn't had an affair with another man, they wouldn't have split up.