| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] it [vb mod] [adv] happen | 11 |
|
| 2 | [vb past] it [modal v] [adv] happen | 11 |
|
| 3 | [vb past] it would [adv] happen | 9 |
|
| 4 | [vb past] it would [adv] happen | 8 |
|
