| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] [prep] a | 521 |
|
| 2 | [Wh det] have been [v-ing] [prep] | 195 |
|
| 3 | [Wh det] have been [prep] a | 14 |
|
| 4 | [Wh det] have been [v-ing] a | 13 |
|
