| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be a [adj] period [prep] | 58 |
|
| 2 | [adv] a [adj] period [prep] | 53 |
|
| 3 | be [adv] a [adj] [prep] | 27 |
|
| 4 | be [adv] a period [prep] | 21 |
|
| 5 | be [adv] a [adj] period | 11 |
|
