|Lesson 1A||Lesson 1B||Lesson 2X||Lesson 2A||Lesson 2B||Lesson 2C||Lesson 2D|
Read Document 2X
and Homework 2C.
The grammar eg2C is concerned primarily with the expansion of <LN>, with the inclusion of time strings (<NSTGT>) and subordinate clauses (<SUB1>), and with the restriction of adverbs to particular slots. Also <LNR> is revised to include <NVAR> instead of <*N> so that both nouns and pronouns can be grouped together instead of having <LPROR> as an option of <NSTG>.
<LN> is expanded to include quantity modifiers (<QPOS>) and noun modifiers (<NPOS>), as in few stone towers. <APOS> is made recursive to allow for more than one adjective (few old green stone towers. <QPOS> now calls on an LXR type definition (<LQR>), as does <APOS> (<LAR>). <LAR> includes <*ADJ> (a green stone), <*VEN> (a broken stone), and <*VING> (a growing investigation). Both <*Q> and <*ADJ> may have an adverb as a left-adjunct, so <LQ> contains <*D> (very few), and <LA> contains <*D> (very old).
A new agreement restriction WAGREE-LN checks that a SINGULAR (or PLURAL) left adjunct of N agrees with a SINGULAR (or PLURAL) core oF <NVAR> (ruling out a towers).
Three new options appear in <SA>. These are <TOVO> (e.g. To find the buttons in To find the buttons, they had to dig). Noun strings of time <NSTGT> (years ago), and a subordinate clause <SUB1> (while they dug). The restriction WTIME checks that the noun in <NSTGT> has the attribute NTIME1. Subordinate clauses are introduced by words such as while and before in the category CS1.
In eg2C, adverbs may appear in nine possible positions - SA, LT, LQ, LA, RN, LW, RW, LV, RV. Since there are certain subclasses of adverbs that cannot appear freely in all slots, this means that without restrictions a problem can arise with the placement of adverbs. An example was seen in the unintended parse of The found out the facts, where out was parsed as an adverb in <RV> (like They walked out) instead of the initial <*DP> of the object string <DP2> of found. The solution lies in restrictions which allow only adverbs with the correct attribute to fill a given adverb slot.
Few changes are needed in the dictionary. The attributes NTIME1, DLA, DLQ, DLT, DLV, DRN, DRV and DSA are added to the ATTRIBUTE list in eg2C and to the appropriate words.
CHANGES MADE IN THE GRAMMAR
CHANGES MADE IN THE DICTIONARY