| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] has been [v-ing] | 228 |
|
| 2 | which has [been] [v-ing] | 154 |
|
| 3 | what has [been] [v-ing] | 74 |
|
| 4 | [Wh det] has [been] happening | 47 |
|
| 5 | [Wh det] has [been] going | 29 |
|
| 6 | [Wh det] has [been] running | 12 |
|
| 7 | [Wh det] has [been] working | 7 |
|
