| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] [prep] a | 594 |
|
| 2 | [vb mod] have been [v-ing] [prep] | 288 |
|
| 3 | [vb mod] have been [prep] a | 102 |
|
| 4 | [vb mod] have been [v-ing] a | 52 |
|
