| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | this [vb past] at a [noun sg] | 8 |
|
| 2 | this [vb past] at a [noun] | 8 |
|
| 3 | this [vb past] at a time | 7 |
|
| 4 | this [vb past] at a time | 7 |
|
