| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they had been [verb] | 1206 |
|
| 2 | they had been [v-ing] | 294 |
|
| 3 | [pron] had been walking | 28 |
|
| 4 | [pers pn] had been walking | 26 |
|
| 5 | they have been walking | 8 |
|
| 6 | they [verb] been walking | 8 |
|
| 7 | they [vb past] been walking | 7 |
|
| 8 | they had be walking | 6 |
|
| 9 | they had [be] walking | 6 |
|
| 10 | they had been walking | 6 |
|
| 11 | they had [been] walking | 6 |
|
| 12 | they had been walk | 6 |
|
