| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been walking | 43 |
|
| 2 | 've been walking | 10 |
|
| 3 | has been walking | 7 |
|
| 4 | 'd been walking | 7 |
|
| 5 | have been walking | 6 |
|
| 6 | have been walking | 5 |
|
