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REWRITE SYSTEMS
Dr.VMS
THE BOY SOLVED THE PROBLEM
PS RULES
NP - VP - PP
TIM THOUGHT THAT KATE BELIEVED THE
STORY
PS DESCRIPTION
TIM THOUGHT THAT KATE BELIEVED THAT GREG
IS A LIAR
PS DESCRIPTION
REWRITE METHODS
 AP
 NP
 VP
 PP
 DP
 TP
 CP
DP
NP
TP
TP
rewrite systems.pptx
rewrite systems.pptx
rewrite systems.pptx
BOTTOM-UP TREES
 This method for tree drawing often works
best for beginners. Here are some (hopefully
helpful) steps to go through when drawing
trees.
 D A A N V D N
 The very small boy kissed the platypus
BOTTOM-UP TREES
THE TOP-DOWN METHOD OF TREES
 Most professional syntacticians use a slightly
quicker means of drawing trees. Once you are
practiced at identifying tree structures, you will
probably want to use this technique. But be
warned, sometimes this technique can lead you
astray if you are not careful
 This method starts out the same way as the other:
write out the sentence and identify the parts of
speech.
 D A A N V D N
 The very small boy kissed the platypus.
 Next draw the S node at the top of the tree, with
the subject NP and VP underneath:
TOP-DOWN
TOP-DOWN
TOP-DOWN
AP-NP
AMBIGUITY
PS RULES

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rewrite systems.pptx