1. In the text we briefly discussed the problems of understanding natural languages as opposed to formal programming languages. As an example of the complexities involved in the case of natural languages, identify situations in which the question “Do you know what time it is?” has different meanings.
2. Changes in the context of a sentence can change the significance of the sentence as well as its meaning. In the context of Figure 10.4, how would the significance of the sentence “Mary hit John” change if the birth dates were in the 1960s? What if one were in the 1960s and the other in the 1990s?