| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] happens when a | 17 |
|
| 2 | [pron] happens when a | 17 |
|
| 3 | what happens when a | 17 |
|
| 4 | what happens when a | 17 |
|
| 5 | happens when a [noun] | 17 |
|
| 6 | happens when a [noun sg] | 17 |
|
| 7 | happens when a [adj] | 5 |
|
| 8 | happens when a [adj] | 5 |
|
