| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [adv] [vb pp] at a time | 5 |
|
| 2 | be [adv] [vb pp] at a time | 5 |
|
| 3 | [adv] [vb pp] at a time [Wh adv] | 6 |
|
| 4 | [adv] [vb pp] at a time [adv] | 6 |
|
| 5 | [adv] [vb pp] at a time when | 6 |
|
| 6 | [adv] [vb pp] at a time when | 6 |
|
