| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [Wh det] [vb mod] [vb infin] happen | 67 |
|
| 2 | [v-ing] [Wh det] [vb mod] [vb infin] [verb] | 10 |
|
| 3 | [v-ing] [Wh det] [modal v] [vb infin] happen | 5 |
|
| 4 | [v-ing] [pron] [vb mod] [vb infin] happen | 5 |
|
| 5 | [v-ing] [Wh det] [vb mod] [verb] happen | 5 |
|
