| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [adv] been refer [prep] | 27 |
|
| 2 | [Wh det] has been refer [prep] | 10 |
|
| 3 | [Wh det] has [adv] been [prep] | 9 |
|
| 4 | [Wh det] has [adv] been refer | 5 |
|
