| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] a | 915 |
|
| 2 | [vb past] been [v-ing] a | 321 |
|
| 3 | [vb past] have been a | 42 |
|
| 4 | [vb past] have been [v-ing] | 41 |
|
