| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what have been [v-ing] in | 27 |
|
| 2 | what have [been] happening in | 24 |
|
| 3 | what has [been] [v-ing] in | 13 |
|
| 4 | what 's [been] [v-ing] in | 10 |
|
