| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | on which [pers pn] be engaged | 8 |
|
| 2 | on which he [be] engaged | 5 |
|
| 3 | on which [pers pn] [was/were] engaged | 5 |
|
| 4 | on which [pers pn] was engaged | 5 |
|
