| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which they [verb] been [v-ing] | 20 |
|
| 2 | which they have been [v-ing] | 20 |
|
| 3 | which they [vb past] been [v-ing] | 12 |
|
| 4 | which they had been [v-ing] | 11 |
|
| 5 | which they [vb base] been [v-ing] | 8 |
|
| 6 | which they have been [v-ing] | 7 |
|
