| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they had [been] [verb] | 1281 |
|
| 2 | they had [been] [v-ing] | 307 |
|
| 3 | [pron] had [been] walking | 28 |
|
| 4 | they have [been] walking | 8 |
|
| 5 | they [verb] [been] walking | 8 |
|
| 6 | they [vb past] [been] walking | 7 |
|
| 7 | they had [be] walking | 6 |
|
| 8 | they had [been] walk | 6 |
|
