| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] a [adj] period [prep] | 58 |
|
| 2 | [adv] a [adj] period [prep] | 58 |
|
| 3 | [adv] a [adj] period [prep] | 53 |
|
| 4 | [adv] a [adj] period of | 45 |
|
| 5 | [adv] a [adj] period of | 45 |
|
| 6 | [adv] a [adj] period [prep] | 29 |
|
| 7 | [adv prt] a [adj] period [prep] | 25 |
|
| 8 | over a [adj] period [prep] | 21 |
|
| 9 | over a [adj] period [prep] | 21 |
|
| 10 | only a [adj] period [prep] | 14 |
|
| 11 | only a [adj] period [prep] | 14 |
|
| 12 | [adv] a long period [prep] | 13 |
|
| 13 | [adv] a long period [prep] | 13 |
|
| 14 | [adv] a short period [prep] | 12 |
|
| 15 | [adv] a short period [prep] | 12 |
|
| 16 | [adv] an [adj] period [prep] | 5 |
|
