| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [modal v] [verb] at a | 110 |
|
| 2 | [noun] [verb] at a time | 98 |
|
| 3 | [modal v] [verb] at a time | 9 |
|
| 4 | [noun] [modal v] [verb] a time | 9 |
|
