| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [verb] a [adj] period [prep] | 24 |
|
| 2 | [adv] [verb] a [adj] period [prep] | 24 |
|
| 3 | [adv] [verb] a [adj] period [prep] | 24 |
|
| 4 | [adv] [verb] a [adj] period [prep] | 21 |
|
| 5 | [adv] [verb] a [adj] period of | 19 |
|
| 6 | [adv] [verb] a [adj] period of | 19 |
|
| 7 | [adv] [vb past] a [adj] period [prep] | 9 |
|
| 8 | [adv] [vb infin] a [adj] period [prep] | 5 |
|
| 9 | [adv] [verb] a long period [prep] | 5 |
|
| 10 | [adv] [verb] a long period [prep] | 5 |
|
