| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [verb] been [adv] [v-ing] [prep] | 10 |
|
| 2 | which have been [adv] [v-ing] [prep] | 10 |
|
| 3 | which [vb past] been [adv] [v-ing] [prep] | 6 |
|
| 4 | which had been [adv] [v-ing] [prep] | 6 |
|
