| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] a [noun] [prep] | 18046 |
|
| 2 | when a [noun] [prep] | 507 |
|
| 3 | when [v-ing] a [noun] | 478 |
|
| 4 | when [v-ing] [noun] [prep] | 317 |
|
