PATR Exercise 1

Graded Exercises

1. *
   1. Create a working directory
   2. Save grammar.grm and lexicon.lex in that directory
   3. Try out the following sentences:
      • uther sleeps
      • Uther sleeps
      • uther sleep
   4. Try "help" which gives you a list of commands and then "help cmd" to find out about any particular command

    

2. * Add the words "he" and "him" to lexicon.lex. Make the grammar accept "he sleeps" and reject "him sleeps" and "him sleep"
3. * Add feature specifications to the first grammar rule so that the subject of the sentence is explicitly marked in the feature structure of the S

4. ** Modify the first grammar and lexicon to parse sentences with verbs that take complements, i.e. that can successfully analyse 
   1. Uther storms Cornwall
   2. Uther gave Arthur Cornwall

   but that rejects sentences with the wrong number of complements for the verb e.g. Uther sleeps Cornwall

    

5. *Modify grammar to parse "Uther wants to sleep". Hint: You need to produce the following syntactic structure.

              S 
      ________|_________
      NP              VP 
      |         _______|_______
      n        VP             S 
    Uther      |           ___|____
               v           to sleep
               |
             wants
   

   Apart from the entry for "want", exactly one more grammar rule is required

   You may wish to consult this

   Patr Reference Manual