Bernd Heine is Emeritus Professor at University of Cologne, and has held visiting professorships at universities across the world, including Guangdong University of Foreign Studies, La Trobe University, the University of Cape Town, Dartmouth College, and Universidade Federal Fluminense. His main research areas are currently grammaticalization theory, endangered languages in Africa, and discourse grammar. His many publications with OUP include The Changing Languages of Europe (2006) and The Genesis of Grammar: A Reconstruction (2007), both with Tania Kuteva, and Grammaticalization (with Heiko Narrog, 2021). He is also the editor, with Heiko Narrog, of The Oxford Handbook of Linguistic Analysis (2010; second edition 2015), The Oxford Handbook of Grammaticalization (2010), and Grammaticalization from a Typological Perspective (2018).

• 1: Interactives 2: Argument structure 3: Types of interactives 4: Development of interactives 5: Related approaches 6: The status of interactives 7: Deciding between two grammars 8: Conclusions References Index

Bernd Heine is Emeritus Professor at University of Cologne, and has held visiting professorships at universities across the world, including Guangdong University of Foreign Studies, La Trobe University, the University of Cape Town, Dartmouth College, and Universidade Federal Fluminense. His main research areas are currently grammaticalization theory, endangered languages in Africa, and discourse grammar. His many publications with OUP include The Changing Languages of Europe (2006) and The Genesis of Grammar: A Reconstruction (2007), both with Tania Kuteva, and Grammaticalization (with Heiko Narrog, 2021). He is also the editor, with Heiko Narrog, of The Oxford Handbook of Linguistic Analysis (2010; second edition 2015), The Oxford Handbook of Grammaticalization (2010), and Grammaticalization from a Typological Perspective (2018).

• 1: Interactives 2: Argument structure 3: Types of interactives 4: Development of interactives 5: Related approaches 6: The status of interactives 7: Deciding between two grammars 8: Conclusions References Index

Bernd Heine is Emeritus Professor at University of Cologne, and has held visiting professorships at universities across the world, including Guangdong University of Foreign Studies, La Trobe University, the University of Cape Town, Dartmouth College, and Universidade Federal Fluminense. His main research areas are currently grammaticalization theory, endangered languages in Africa, and discourse grammar. His many publications with OUP include The Changing Languages of Europe (2006) and The Genesis of Grammar: A Reconstruction (2007), both with Tania Kuteva, and Grammaticalization (with Heiko Narrog, 2021). He is also the editor, with Heiko Narrog, of The Oxford Handbook of Linguistic Analysis (2010; second edition 2015), The Oxford Handbook of Grammaticalization (2010), and Grammaticalization from a Typological Perspective (2018).

• 1: Interactives 2: Argument structure 3: Types of interactives 4: Development of interactives 5: Related approaches 6: The status of interactives 7: Deciding between two grammars 8: Conclusions References Index