1.They have just sold that old house
=>That old house has just been sold.
2.Charles lives quite near his aunt's house.
=> Charles doesn't live far away his aunt's house.
3.It was such a hard cake that I couldn't eat it.
=> The cake is too hard for us to eat.
4.Linh is a better cook than Hoa.
=> Hoa can't cook as well as Linh.