| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what have been happening [prep] | 55 |
|
| 2 | what have been happening [prep] | 55 |
|
| 3 | what have been [verb] to | 51 |
|
| 4 | what have been [v-ing] to | 15 |
|
| 5 | what have [be] happening to | 14 |
|
| 6 | [pron] have been happening to | 14 |
|
| 7 | what [verb] been happening to | 14 |
|
| 8 | what have been happening to | 14 |
|
| 9 | what have be happening to | 14 |
|
| 10 | what have [been] happening to | 14 |
|
| 11 | what have been happen to | 14 |
|
