| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] [verb] [prep] a time | 20 |
|
| 2 | [noun prp] [vb past] [prep] a time | 16 |
|
| 3 | [noun prp] [verb] for a time | 9 |
|
| 4 | [noun prp] [verb] for a time | 9 |
|
| 5 | [noun prp] [verb] at a time | 8 |
|
| 6 | [noun prp] [verb] at a time | 8 |
|
