| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have happened | 436 |
|
| 2 | [modal v] have happened | 436 |
|
| 3 | [adv] have happened | 166 |
|
| 4 | would have happened | 147 |
|
| 5 | would have happened | 147 |
|
| 6 | could have happened | 104 |
|
| 7 | could have happened | 104 |
|
| 8 | [not/n't] have happened | 94 |
|
| 9 | not have happened | 94 |
|
| 10 | might have happened | 77 |
|
| 11 | might have happened | 77 |
|
| 12 | [adv] have happened | 72 |
|
| 13 | never have happened | 52 |
|
| 14 | never have happened | 52 |
|
| 15 | must have happened | 49 |
|
| 16 | must have happened | 49 |
|
| 17 | not have happened | 49 |
|
| 18 | n't have happened | 45 |
|
| 19 | should have happened | 28 |
|
| 20 | should have happened | 28 |
|
| 21 | may have happened | 20 |
|
| 22 | may have happened | 20 |
|
| 23 | [pron] have happened | 11 |
|
| 24 | [pers pn] have happened | 8 |
|
| 25 | it have happened | 8 |
|
| 26 | it have happened | 8 |
|
| 27 | [adj] have happened | 6 |
|
| 28 | [det] have happened | 6 |
|
| 29 | can have happened | 5 |
|
| 30 | will have happened | 5 |
|
