hopefully it passes this time.
although it appears like a double negative, maybe there should also be a comma in the middle
maybe one of these would solve these problems,

1. In order to instantiate abstract class X, need to implement abstract methods foo, bar
2. In order to instantiate abstract class X, need an implementation for abstract methods foo, bar
3. To instantiate abstract class X, need an implementation for abstract methods foo, bar
4. Can't instantiate abstract class X, as abstract methods foo, bar are not implemented (but it is again double negative)
5. Instantiation of abstract class X needs an implementation for abstract methods foo, bar