| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [v-ing] a [det] | 233 |
|
| 2 | [prep] [v-ing] [det] time | 71 |
|
| 3 | [prep] a [det] time | 55 |
|
| 4 | [v-ing] a [det] time | 14 |
|
