| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which has been [v-ing] | 154 |
|
| 2 | what has been [v-ing] | 74 |
|
| 3 | [Wh det] has been happening | 47 |
|
| 4 | [Wh det] has been going | 29 |
|
| 5 | [Wh det] has been running | 12 |
|
| 6 | [Wh det] has been working | 7 |
|
