| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [prep] a | 27362 |
|
| 2 | [prep] a time | 4727 |
|
| 3 | [v-ing] [prep] time | 254 |
|
| 4 | [v-ing] a time | 33 |
|
