| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adj] period [prep] | 11 |
|
| 2 | [be] [adj] period of | 10 |
|
| 3 | [be] [det] period [prep] | 9 |
|
| 4 | is [adj] period [prep] | 7 |
|
| 5 | [is] [adj] period [prep] | 7 |
|
