| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [vb pp] at a time | 17 |
|
| 2 | has [verb] at a time | 6 |
|
| 3 | have come at a time | 5 |
|
| 4 | had [verb] at a time | 5 |
|
| 5 | have come at a time | 5 |
|
