| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a short time | 376 |
|
| 2 | [vb past] [prep] a time | 133 |
|
| 3 | [vb past] [prep] a short | 80 |
|
| 4 | [vb past] a short time | 20 |
|
