| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [vb pp] [prep] a long | 128 |
|
| 2 | [verb] [prep] a long period | 91 |
|
| 3 | [vb pp] [prep] a long period | 67 |
|
| 4 | [verb] [vb pp] [prep] a period | 22 |
|
| 5 | [verb] [vb pp] a long period | 5 |
|
