| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [adv] [prep] a time | 25 |
|
| 2 | [vb past] [adv] [prep] a time | 19 |
|
| 3 | [vb past] [adv] for a time | 12 |
|
| 4 | [vb past] [adv] for a time | 12 |
|
| 5 | [vb past] [adv] at a time | 6 |
|
| 6 | [vb past] [adv] at a time | 6 |
|
| 7 | [vb past] [adv prt] [prep] a time | 5 |
|
