| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [Wh pn] [modal v] [verb] [pers pn] back | 5 |
|
| 2 | [pron] [Wh pn] [vb mod] [verb] [pron] back | 5 |
|
| 3 | [pron] [Wh pn] [modal v] [vb infin] [pron] back | 5 |
|
| 4 | [pron] who [modal v] [verb] [pron] back | 5 |
|
| 5 | [pron] [Wh pn] [modal v] [verb] [pron] back | 5 |
|
| 6 | [indef pn] [Wh pn] [modal v] [verb] [pron] back | 5 |
|
