CCGrebank distinguishes different subtypes of the basic S
category with features: [ng] for present participle,
[pt] for past participle, [dcl] for indicative,
[b] for infinitive and imperative, [to] for
to-infinitive, [q] for yes/no questions, [wq]
for wh-questions, [em] for embedded clauses and
[intj] for interjections.
Although this feature set is designed for English and additional distinctions would make sense for other languages (for example, main vs. subordinate clause for German and Dutch), the features can in most cases be applied to our target languages, and we stick with the existing feature set for now.
VP and S modifiers are underspecified for the clause type they modify, using
just plain S categories. For example:
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S[dcl]
< 0
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However, categories in → punctuation and → coordination that modify such constituents do carry the feature.
Adverbs modifying adjectives also specify the [adj] feature:
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S[dcl]
< 0
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Subordinating conjunctions also have a specified S[dcl] argument:
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S[dcl]
< 0
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Be advised that the German morpheme zu marking [to]-type
clauses may be hiding inside a separable verb:
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S[dcl]
< 0
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The Dutch equivalent of to is te, but additionally the om
complementizer frequently appears before [to] clauses. We give om
category (S[to]\NP)/(S[to]\NP).