| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what have been happening [prep] | 55 |
|
| 2 | what have been happening [prep] | 55 |
|
| 3 | what has been happening [prep] | 28 |
|
| 4 | what have been happening in | 24 |
|
| 5 | what have been happening in | 24 |
|
| 6 | what 's been happening [prep] | 20 |
|
| 7 | what have been happening to | 14 |
|
| 8 | what have been happening to | 14 |
|
| 9 | what had been happening [prep] | 7 |
|
