| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] at a time of | 52 |
|
| 2 | [vb pp] at a time of | 25 |
|
| 3 | come at a time of | 13 |
|
| 4 | [vb past] at a time of | 11 |
|
| 5 | [v-ing] at a time of | 7 |
|
| 6 | comes at a time of | 5 |
|
| 7 | [vb -s] at a time of | 5 |
|
