| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] a [adj] period of | 87 |
|
| 2 | [vb pp] [prep] a [adj] period of | 80 |
|
| 3 | [vb pp] for a [adj] period of | 29 |
|
| 4 | [vb pp] [prep] a long period of | 27 |
|
| 5 | [vb pp] [prep] a long period of | 24 |
|
| 6 | [vb pp] over a [adj] period of | 23 |
|
| 7 | [vb pp] [prep] a short period of | 10 |
|
| 8 | [vb pp] [prep] a short period of | 8 |
|
| 9 | [vb pp] within a [adj] period of | 6 |
|
| 10 | [vb pp] in a [adj] period of | 6 |
|
| 11 | [vb pp] after a [adj] period of | 6 |
|
| 12 | [vb pp] [prep] a [adj -er] period of | 6 |
|
| 13 | [vb pp] by a [adj] period of | 6 |
|
