| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [v-ing] [prep] a | 3755 |
|
| 2 | [v-ing] [prep] a time | 75 |
|
| 3 | [prep] [v-ing] [prep] time | 26 |
|
| 4 | [prep] [prep] a time | 9 |
|
