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