| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [adv] [prep] a period | 26 |
|
| 2 | [be] [vb pp] [adv] [prep] a period | 26 |
|
| 3 | be [vb pp] [adv] [prep] a period | 9 |
|
| 4 | [be] [vb pp] [adv] [prep] a period | 9 |
|
| 5 | have [vb pp] [adv] [prep] a period | 6 |
|
| 6 | [verb] [vb pp] [adv] [prep] a period | 6 |
|
| 7 | [was/were] [vb pp] [adv] [prep] a period | 6 |
|
| 8 | [vb pp] [adv] [prep] a [adj] period | 40 |
|
| 9 | [vb pp] [adv] [prep] a [adj] period | 36 |
|
| 10 | [vb pp] [adv] [prep] a long period | 9 |
|
| 11 | [vb pp] [adv] [prep] a long period | 7 |
|
| 12 | [vb pp] [adv] [prep] a continuous period | 5 |
|
| 13 | [vb pp] [adv] [prep] a continuous period | 5 |
|
| 14 | [vb pp] [adv] [prep] a period [prep] | 32 |
|
| 15 | [vb pp] [adv] [prep] a period [prep] | 32 |
|
| 16 | [vb pp] [adv] [prep] a period of | 31 |
|
| 17 | [vb pp] [adv] [prep] a period of | 31 |
|
