| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] at a [adj] [noun] | 319 |
|
| 2 | [verb] at a [adj] time | 136 |
|
| 3 | [to-vb] at [art] [adj] time | 74 |
|
| 4 | [to-vb] [prep] a [adj] time | 48 |
|
