| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [Wh pn] happened to be [v-ing] | 6 |
|
| 2 | [Wh pn] happened to be [v-ing] [prep] | 6 |
|
| 3 | [Wh pn] happened to be [v-ing] [prep] | 6 |
|
