| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] [been] [vb pp] | 2673 |
|
| 2 | [been] [vb pp] a | 1298 |
|
| 3 | [to-vb] [vb pp] a | 1013 |
|
| 4 | [to-vb] [been] a | 404 |
|
