| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] a [adj] time | 406 |
|
| 2 | [vb pp] [prep] a certain [noun] | 211 |
|
| 3 | [vb pp] [prep] a certain [noun sg] | 204 |
|
| 4 | [verb] [prep] a certain time | 23 |
|
| 5 | [vb pp] [prep] a certain time | 12 |
|
| 6 | [vb pp] [prep] [art] certain time | 12 |
|
| 7 | [vb pp] [prep] a certain time | 12 |
|
