| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] has been happening | 50 |
|
| 2 | [Wh det] has been happening | 47 |
|
| 3 | what has been happening | 47 |
|
| 4 | what has been happening | 47 |
|
| 5 | [adj] has been happening | 8 |
|
| 6 | [det] has been happening | 7 |
|
| 7 | [adv] has been happening | 5 |
|
| 8 | that has been happening | 5 |
|
| 9 | that has been happening | 5 |
|
| 10 | [adv] has been happening | 5 |
|
| 11 | has been happening [prep] | 38 |
|
| 12 | has been happening [prep] | 38 |
|
| 13 | has been happening in | 16 |
|
| 14 | has been happening in | 16 |
|
| 15 | has been happening [adv] | 9 |
|
| 16 | has been happening to | 8 |
|
| 17 | has been happening to | 8 |
|
| 18 | has been happening [adv] | 8 |
|
