| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] [vb past] it [verb] | 304 |
|
| 2 | [Wh adv] [vb past] it happen | 64 |
|
| 3 | [Wh adv] [vb past] it [vb pp] | 21 |
|
| 4 | [Wh adv] [verb] it happened | 11 |
|
| 5 | [adv] [vb past] it happened | 8 |
|
| 6 | [Wh adv] [vb past] [pron] happened | 7 |
|
