| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] at a [adj -er] | 222 |
|
| 2 | [vb pp] at a time | 148 |
|
| 3 | at a [adj -er] time | 70 |
|
| 4 | [vb pp] a [adj -er] time | 10 |
|
