| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv prt] [prep] [art] certain time | 11 |
|
| 2 | [adv prt] [prep] [art] certain time | 11 |
|
| 3 | [adv prt] [prep] a certain time | 11 |
|
| 4 | [adv prt] [prep] a certain time | 11 |
|
| 5 | [adv prt] at [art] certain time | 6 |
|
| 6 | [adv prt] at [art] certain time | 6 |
|
| 7 | in [prep] [art] certain time | 5 |
|
