| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adj] [prep] a period | 20 |
|
| 2 | be [adj] [prep] a period | 8 |
|
| 3 | be [adj] over a period | 6 |
|
| 4 | be [adj] over a period | 6 |
|
| 5 | are [adj] [prep] a period | 5 |
|
| 6 | be [adj] for a period | 5 |
|
| 7 | be [adj] for a period | 5 |
|
