| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] how it have happen | 5 |
|
| 2 | [vb infin] [Wh adv] it have happen | 5 |
|
| 3 | [vb infin] [adv] it have happen | 5 |
|
| 4 | [vb infin] how it have happen | 5 |
|
| 5 | [vb infin] it have [adv] happen | 5 |
|
