| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] a period [prep] | 232 |
|
| 2 | [prep] a long period [prep] | 179 |
|
| 3 | [vb pp] [prep] a long period | 67 |
|
| 4 | [vb pp] a long period [prep] | 9 |
|
