| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] a time [adv] | 281 |
|
| 2 | [modal v] [verb] [prep] a [adv] | 245 |
|
| 3 | [modal v] [verb] a time [adv] | 26 |
|
| 4 | [modal v] [verb] [prep] a time | 21 |
|
