| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what has been [verb] [prep] | 221 |
|
| 2 | what have been happening [prep] | 55 |
|
| 3 | what [verb] been happening [prep] | 55 |
|
| 4 | what [vb -s] been happening [prep] | 48 |
|
| 5 | what has been [v-ing] [prep] | 31 |
|
| 6 | what has be happening [prep] | 28 |
|
| 7 | what has [be] happening [prep] | 28 |
|
| 8 | [pron] has been happening [prep] | 28 |
|
| 9 | what has [been] happening [prep] | 28 |
|
| 10 | what has been happen [prep] | 28 |
|
