| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adv] a period [prep] | 21 |
|
| 2 | be [adv] a period of | 17 |
|
| 3 | be [adv] a period of | 17 |
|
| 4 | be [adv] a period [prep] | 16 |
|
| 5 | was [adv] a period [prep] | 9 |
|
| 6 | is [adv] a period [prep] | 7 |
|
| 7 | be also a period [prep] | 6 |
|
| 8 | be also a period [prep] | 6 |
|
| 9 | be not a period [prep] | 5 |
|
| 10 | be [not/n't] a period [prep] | 5 |
|
| 11 | were [adv] a period [prep] | 5 |
|
| 12 | be not a period [prep] | 5 |
|
