| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [to-vb] a | 4914 |
|
| 2 | [vb base] been a | 739 |
|
| 3 | [vb base] [to-vb] been | 569 |
|
| 4 | [to-vb] been a | 490 |
|
