| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [verb] at a [noun] | 155 |
|
| 2 | [modal v] [verb] at [art] time | 34 |
|
| 3 | [modal v] [verb] at [art] time | 34 |
|
| 4 | [modal v] [verb] [prep] a time | 21 |
|
| 5 | [modal v] [verb] [prep] a time | 21 |
|
| 6 | [modal v] [verb] at a time | 9 |
|
| 7 | [modal v] [verb] at a time | 9 |
|
