| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what have been [verb] in | 94 |
|
| 2 | what have been happening [prep] | 55 |
|
| 3 | what have been [v-ing] in | 27 |
|
| 4 | what have be happening in | 24 |
|
| 5 | [pron] have been happening in | 24 |
|
| 6 | what have been happen in | 24 |
|
| 7 | what have [be] happening in | 24 |
|
| 8 | what [verb] been happening in | 24 |
|
| 9 | what have [been] happening in | 24 |
|
