| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] at a | 1601 |
|
| 2 | [vb pp] at a time | 148 |
|
| 3 | be at a time | 29 |
|
| 4 | be [vb pp] a time | 9 |
|
| 5 | be [vb pp] at time | 8 |
|
