Practical Grammar 7

Prepositional Phrases: explaining the complex annotation

The textbook contains a c-structure rule for VP like the following:

1. VP → V          PP
       ↑=↓   (↑ (↓ PCASE)) = ↓

which translates into the following xlfg rule:

1. VP → V PP
2. {
3. ↑=↓1;
4. (↑ (↓2 PCASE)) = ↓2;
5. }

Explaining the meaning of (↑ (↓ PCASE)) = ↓

The annotation on the PP looks a lot scarier than it actually is! Let us look at its structure piece by piece. To do this, we will begin by looking at the annotations in the following rule one more time:

1. VP → V DP
2. {
3. ↑=↓1;
4. (↑ OBJ) =↓2;
5. }

Remember that by definition

• ↑ is "the mother's f-structure" and
• ↓2 refers to "the f-structure of daughter 2"

So, in the tree licensed by the rule above ↑ is the VP's f-structure. Let us call that f_VP. And ↓2 refers to the PP's f-structure. Let us correspondingly call that f_PP. With that, the formula (↑ OBJ) =↓2 becomes

(fVP OBJ) = fPP

Given the following:

(fVP OBJ) = the value of the attribute OBJ in the f-structure of the VP

(fVP OBJ) = fPP means:

The value of the attribute OBJ in the f-structure of the VP is the f-structure of the PP.