| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [adv] a period [prep] | 23 |
|
| 2 | [noun sg] [vb past] a period [prep] | 19 |
|
| 3 | [noun sg] [vb past] [adv] a period | 10 |
|
