| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] a [adj] time | 379 |
|
| 2 | [adv] [prep] a certain [noun] | 170 |
|
| 3 | [adv] [prep] a certain [noun sg] | 169 |
|
| 4 | [adv] [prep] [art] certain time | 15 |
|
| 5 | [adv] [prep] [art] certain time | 15 |
|
| 6 | [adv] [prep] a certain time | 15 |
|
| 7 | [adv] [prep] a certain time | 15 |
|
