| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [verb] a certain time | 5 |
|
| 2 | [verb] [prep] a certain time | 23 |
|
| 3 | [verb] [prep] a certain time | 23 |
|
| 4 | [verb] at a certain time | 6 |
|
| 5 | [verb] at a certain time | 6 |
|
| 6 | [verb] within a certain time | 5 |
|
| 7 | [verb] within a certain time | 5 |
|
