| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [vb past] [been] [v-ing] [prep] [det] | 6 |
|
| 2 | who [vb past] been [v-ing] [prep] [det] | 6 |
|
| 3 | who had [been] [v-ing] [prep] [det] | 5 |
|
