Chuyển sang câu bị động :
1, The manufacturers are giving away small plastic toys with each packet of cereal.
->Small plastic toys are being given away with each packet of cereal by the manufacturers
2, How many trees did they cut down to build that fence ?
->How many trees were cut down to build that fence ?
chuyển sang câu bị động
1 the manufacturers are giving away small plastic toys with each packet of cereal
=> Smaill plastic toys with each packet of cereal are being given by the manufactures
2 How many trees did they cut down to build that fence?
=>How many trees was that fence cut down to build ?
