The idea here is that when the user writes a statement like:
then the response from the program might (only for example) be
This requires us to change ``i am'' to ``you are'' etc. Here are some examples of simple goals that should succeed:
Some more clauses are needed for swap/2. The guiding principle is that the program `echoes back' the original input. So, a statement ``i like music'' should get echoed back as ``you like music?''. This means that ``i' turns into ``you''.