| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] been [v-ing] | 6806 |
|
| 2 | been [v-ing] a | 1008 |
|
| 3 | [vb base] been a | 739 |
|
| 4 | [vb base] [v-ing] a | 515 |
|
