| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] at a [noun] | 1445 |
|
| 2 | [vb pp] at a [noun sg] | 1355 |
|
| 3 | [vb pp] at [art] time | 805 |
|
| 4 | [vb pp] at [art] time | 805 |
|
| 5 | [verb] at a time | 345 |
|
| 6 | [vb pp] [prep] a time | 233 |
|
| 7 | [vb pp] at a time | 148 |
|
| 8 | [vb pp] at a time | 148 |
|
