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