1.People speak English in the world today (change into passive from) 
--> Enlish.. .. .... . . .........
2. She said: " my mother is a doctor ( Chang into reported speed) 
--> she said................. 
3. Hoa said:" do you live in binh phuoc province,  nam" ( reported speed) 
--> hoa asked nam............
4 Vietnam is a country Vietnam is a country which exports a lot of rice(use a compound word) 
--> viet man is.......