| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun] [verb] at a time | 16 |
|
| 2 | [prep] [noun pl] [verb] at a time | 8 |
|
| 3 | [prep] be [verb] at a time | 6 |
|
| 4 | [prep] [be] [verb] at a time | 6 |
|
| 5 | [prep] [be] [verb] at a time | 5 |
|
| 6 | [prep] be [verb] at a time | 5 |
|
| 7 | [prep] [verb] at a time [adv] | 5 |
|
| 8 | [prep] [verb] at a time when | 5 |
|
| 9 | [prep] [verb] at a time [Wh adv] | 5 |
|
| 10 | [prep] [verb] at a time when | 5 |
|
