| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [vb pp] [prep] a time | 15 |
|
| 2 | [noun] [vb pp] at a time | 12 |
|
| 3 | [noun pl] [vb pp] [prep] a time | 6 |
|
| 4 | [noun] [vb pp] for a time | 5 |
|
