| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [vb pp] [prep] a | 6770 |
|
| 2 | been [vb pp] [prep] [noun pl] | 3061 |
|
| 3 | [vb pp] [prep] a [noun pl] | 493 |
|
| 4 | been [prep] a [noun pl] | 17 |
|
