| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] a period [prep] | 232 |
|
| 2 | be [vb pp] [prep] a period | 61 |
|
| 3 | be [prep] a period [prep] | 7 |
|
| 4 | be [vb pp] [prep] a [prep] | 5 |
|
