| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [vb mod] [verb] | 18418 |
|
| 2 | [Wh det] [vb mod] [vb infin] | 18254 |
|
| 3 | [pron] [vb mod] happen | 1801 |
|
| 4 | [Wh det] [vb mod] happen | 1211 |
|
| 5 | [Wh det] [modal v] happen | 1194 |
|
