| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which they have been [v-ing] [prep] | 9 |
|
| 2 | which they have been [v-ing] [prep] | 9 |
|
| 3 | which they have been [v-ing] for | 6 |
|
| 4 | which they had been [v-ing] [prep] | 5 |
|
