| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [prep] a [noun sg] | 15531 |
|
| 2 | [prep] a [noun sg] when | 1777 |
|
| 3 | [v-ing] a [noun sg] when | 13 |
|
| 4 | [v-ing] [prep] [noun sg] when | 8 |
|
