| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [modal v] have been walking | 5 |
|
| 2 | [pers pn] [modal v] have been walking | 5 |
|
| 3 | [modal v] have been walking [prep] | 5 |
|
| 4 | [modal v] have been walking [prep] | 5 |
|
