Exam-like questions

From last years exam:

Represent the following facts in the language of predicate logic:

• Every apple is either green or yellow.
• No apple is blue.
• If an apple is green then it is tasty.
• Every man likes a tasty apple.

An exam-like one:

``Herbert is a small hippopotamus who lives in Edinburgh zoo. Like all hippopoamuses he eats grass and likes swimming''

Represent the above:

1. as a semantic net [6 marks]
2. in predicate logic [6 marks]

Give two new facts about Herbert that are:

1. Easier to represent in a semantic net than in predicate logic [4 marks]
2. Easier to represent in logic than in a semantic net [4 marks]

Give a possible advantage of predicate logic over semantic nets other than representational adequacy [5 marks]