| 0 | empty operator |
| * | unspecified empty constituent |
| *arb* | arbitrary PRO subject in ECM infinitives |
| *con* | subject elided under conjunction |
| *exp* | empty expletive subject |
| *pro* | "small pro" subject |
| *ICH* | non-wh trace |
| *T* | wh-trace |
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Phrase Labels Word Labels Word-or-Phrase Labels Suffix Labels Table of Contents |