| Acknowledgements | 5 |
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| Contents | 7 |
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| Chapter 1 Introduction and background | 11 |
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| 1. An outline of the project | 11 |
| 2. An overview of the literature on cleft sentences | 15 |
| 2.1. The expletive approach | 15 |
| 2.2. The extraposition approach | 17 |
| 3. A constructional approach to it-clefts | 19 |
| 4. A diachronic approach to it-clefts | 22 |
| 5. Methodology | 24 |
| Chapter 2 A model of language structure and language change | 26 |
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| 1. Some basic assumptions | 26 |
| 2. A constructional model of language structure | 27 |
| 3. A constructional model of language change | 31 |
| 4. The application to it-clefts and copular constructions | 35 |
| Chapter 3 Specificational copular constructions | 37 |
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| 1. Different and competing analyses | 37 |
| 1.1. The equative approach | 38 |
| 1.2. The inverse approach | 40 |
| 1.3. A less formal approach | 42 |
| 2. Specification as (the inverse of) nominal predication | 44 |
| 2.1. Specification and definite NP predicates | 44 |
| 2.2. Specification and inversion | 48 |
| 2.3. Capturing this account in cognitive and constructional frameworks | 52 |
| 3. Accounting for the behaviour of indefinite NPs | 57 |
| 3.1. Specification and indefinite NP predicates | 58 |
| 3.2. An account based on discourse requirements | 59 |
| 3.3. An account based on definiteness | 61 |
| 4. Summarizing and extending the account | 66 |
| 4.1. An overview of specificational NP be NP sentences | 66 |
| 4.2. Positioning this account in relation to the literature | 68 |
| 4.3. Other specificational copular constructions | 72 |
| 4.3.1. Th-clefts as specificational copular sentences | 73 |
| 4.3.2. Wh-clefts as specificational copular sentences | 74 |
| 4.3.3. All-clefts as specificational copular sentences | 78 |
| 4.3.4. A family of specificational copular sentences | 79 |
| Chapter 4 It-clefts as specificational copular sentences | 81 |
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| 1. The English it-cleft | 81 |
| 1.1. A “discontinuous constituent“ account of it-clefts | 82 |
| 1.2. Explaining the it-cleft’s pragmatic properties | 88 |
| 1.2.1. Focus | 89 |
| 1.2.2. Presupposition | 90 |
| 1.2.3. Exhaustiveness | 92 |
| 1.2.4. Contrast | 95 |
| 1.3. Explaining the it-cleft’s structural properties | 97 |
| 1.3.1. The behaviour of the cleft clause | 98 |
| 1.3.2. The evidence for VP constituency | 103 |
| 1.3.3. The evidence from agreement | 106 |
| 1.4. Interim summary | 111 |
| 2. A comparison with expletive accounts of it-clefts | 112 |
| 3. A comparison with other extraposition accounts of it-clefts | 117 |
| 3.1. The early extraposition accounts of the 1970s | 117 |
| 3.2. The more recent discontinuous constituent accounts | 120 |
| 3.3. A different extraposition account? | 124 |
| 4. A comparison with other constructional accounts of it-clefts | 125 |
| Chapter 5 Other varieties of it-cleft | 130 |
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| 1. Beyond the archetypal it-cleft | 130 |
| 2. Predicational (and proverbial) it-clefts | 132 |
| 2.1. An expletive approach to predicational it-clefts | 133 |
| 2.2. Predicational it-clefts and the inverse approach | 137 |
| 2.3. Predicational it-clefts and the equative approach | 141 |
| 3. It-clefts with non-nominal foci | 144 |
| 4. Informative-presupposition (IP) it-clefts | 150 |
| 5. Summary | 156 |
| Chapter 6 The it-cleft and earlier periods of English | 158 |
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| 1. Beyond the present-day language system | 158 |
| 2. The early history of the English it-cleft | 159 |
| 3. A restrictively modified pronoun? | 162 |
| 4. An obligatorily extraposed relative clause? | 167 |
| 5. An unusual pattern of agreement? | 172 |
| 6. The evidence from Old English gender agreement | 180 |
| 7. The it-cleft as a relic from an earlier time | 187 |
| 8. Summary | 193 |
| Chapter 7 The it-cleft’s development over time | 194 |
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| 1. A diachronic investigation | 194 |
| 2. The corpora, the search and the selection process | 194 |
| 2.1. OE presentational/impersonal sentences | 196 |
| 2.2. Existential sentences with it | 200 |
| 2.3. The pattern I it am | 201 |
| 2.4. Other constructions mistaken for clefts | 202 |
| 2.5. Interim summary | 203 |
| 3. Frequency information | 204 |
| 4. Changes to the clefted constituent | 206 |
| 5. Changes to the cleft clause | 214 |
| 6. Summary | 221 |
| Chapter 8 The it-cleft and constructional change | 222 |
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| 1. The two kinds of constructional change | 222 |
| 2. A grammatical constructionalization account | 223 |
| 3. Some alternative explanations | 228 |
| 3.1. An impersonal account | 229 |
| 3.2. A Celtic account | 231 |
| 3.3. A word order account | 232 |
| 3.4. Interim summary | 234 |
| 4. Why do it-clefts undergo a construction-specific development? | 235 |
| 4.1. Why do it-clefts develop a construction-specific range of foci? | 235 |
| 4.2. Why do it-clefts develop construction-specific discourse functions? | 242 |
| 4.3. Summary | 251 |
| Chapter 9 Conclusions | 253 |
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| Corpora and data sources | 258 |
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| References | 259 |
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| Index | 276 |