| 2000 | Creole Studies (HIL) |
| 2001 | Morphology (HIL) Local causes for language change (LOT) Language change in apparent and real time (LOT) Friese taalbeheersing (UvA) |
| 2002 | Language variation and change (LOT) Statistics in linguistic research (LOT) Comparative perspectives on minority languages in Europe (LOT) Sociolinguistiek (UvA) Friese taalkunde (UvA) | 2003 | Language contact (LOT) Evolution of language (LOT) Language variation and formal theory (LOT) Basiscursus statistiek (VU) |
| 2004 | Microvariation and linguistic theory (LUCL) |
| 2005 |
IELTS - International English Language Testing System (BLTC) Listening 9 Reading 9 Writing 7 Speaking 8 Overall Band Score 8.5 Statistiek (LUCL) |
2006 | Sound change in progress - William Labov (LOT) |