| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [v-ing] [prep] a | 1967 |
|
| 2 | [adv] [prep] a time | 464 |
|
| 3 | [v-ing] [prep] a time | 75 |
|
| 4 | [adv] [v-ing] [prep] time | 14 |
|
