| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun] [Wh adv] [art] | 1078 |
|
| 2 | [prep] [art] time [Wh adv] [art] | 584 |
|
| 3 | [prep] a time [adv] [art] | 403 |
|
| 4 | [prep] a time [Wh adv] [art] | 402 |
|
