| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [verb] [prep] | 65865 |
|
| 2 | been [vb pp] [prep] | 58901 |
|
| 3 | [be] referred [prep] | 1654 |
|
| 4 | be referred [prep] | 1654 |
|
| 5 | been refer [prep] | 200 |
|
| 6 | [been] referred [prep] | 183 |
|
