| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] [prep] a period [prep] | 30 |
|
| 2 | [verb] [adv] [prep] a period [prep] | 30 |
|
| 3 | [verb] [adv] [prep] a period of | 28 |
|
| 4 | [verb] [adv] [prep] a period of | 28 |
|
| 5 | be [verb] [adv] [prep] a period | 10 |
|
| 6 | [be] [verb] [adv] [prep] a period | 10 |
|
| 7 | [noun] [verb] [adv] [prep] a period | 7 |
|
| 8 | [verb] [verb] [adv] [prep] a period | 6 |
|
| 9 | [adv] [verb] [adv] [prep] a period | 5 |
|
| 10 | [verb] [verb] [adv] [prep] a period | 6 |
|
| 11 | [verb] [adv] [adv] [prep] a period | 5 |
|
| 12 | [verb] [adv] [vb pp] [prep] a period | 6 |
|
| 13 | [verb] [adv] [verb] [prep] a period | 6 |
|
| 14 | [verb] [adv] [prep] a [adj] period | 37 |
|
| 15 | [verb] [adv] [prep] a [adj] period | 35 |
|
| 16 | [verb] [adv] [prep] a long period | 11 |
|
| 17 | [verb] [adv] [prep] a long period | 9 |
|
| 18 | [verb] [adv] [prep] a short period | 7 |
|
| 19 | [verb] [adv] [prep] a short period | 7 |
|
| 20 | [verb] [adv] [prep] a continuous period | 5 |
|
| 21 | [verb] [adv] [prep] a continuous period | 5 |
|
