| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] when do [pron] [vb infin] | 7 |
|
| 2 | [prep] when do [pers pn] [vb infin] | 5 |
|
| 3 | since when do [pron] [vb infin] | 5 |
|
| 4 | since when do [pron] [vb infin] | 5 |
|
