| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [prep] a period [prep] | 54 |
|
| 2 | be [vb pp] [prep] a period [prep] | 54 |
|
| 3 | be [vb pp] [prep] a period of | 50 |
|
| 4 | be [vb pp] [prep] a period of | 50 |
|
| 5 | [vb mod] be [vb pp] [prep] a period | 31 |
|
| 6 | [modal v] be [vb pp] [prep] a period | 31 |
|
| 7 | [prep] be [vb pp] [prep] a period | 17 |
|
| 8 | to be [vb pp] [prep] a period | 17 |
|
| 9 | [prep] be [vb pp] [prep] a period | 17 |
|
| 10 | to be [vb pp] [prep] a period | 17 |
|
| 11 | [adv] be [vb pp] [prep] a period | 11 |
|
| 12 | could be [vb pp] [prep] a period | 6 |
|
| 13 | [adv] be [vb pp] [prep] a period | 6 |
|
| 14 | could be [vb pp] [prep] a period | 6 |
|
| 15 | can be [vb pp] [prep] a period | 5 |
|
| 16 | [not/n't] be [vb pp] [prep] a period | 5 |
|
| 17 | can be [vb pp] [prep] a period | 5 |
|
| 18 | not be [vb pp] [prep] a period | 5 |
|
| 19 | not be [vb pp] [prep] a period | 5 |
|
| 20 | be [vb pp] [adv] [prep] a period | 9 |
|
| 21 | be [vb pp] [adv prt] [prep] a period | 7 |
|
| 22 | be [vb pp] [prep] a [adj] period | 70 |
|
| 23 | be [vb pp] [prep] a [adj] period | 55 |
|
| 24 | be [vb pp] [prep] a [adj -er] period | 15 |
|
| 25 | be [vb pp] [prep] a long period | 14 |
|
| 26 | be [vb pp] [prep] a short period | 12 |
|
| 27 | be [vb pp] [prep] a longer period | 10 |
|
| 28 | be [vb pp] [prep] a short period | 8 |
|
| 29 | be [vb pp] [prep] a limited period | 6 |
|
| 30 | be [vb pp] [prep] a limited period | 6 |
|
