| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [vb past] been [verb] [det] | 14 |
|
| 2 | which had [been] [verb] [det] | 14 |
|
| 3 | which [vb past] [been] [vb pp] [det] | 9 |
|
| 4 | which [vb past] [been] [v-ing] [det] | 5 |
|
