Questions about Homework #2

Q: For Question 1, do I only need to give one concrete example that shows a problem for each "solution" ?

A: For each "solution", you should show one concrete example for each class of problem (false negative, false positive, ambiguous parse) for each solution. Of course, if a particular "solution" has no (say) false-negatives, you should state this, and not try to come up with a non-existent false negative example!