| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be a [adj] period [prep] | 63 |
|
| 2 | be a [adj] period [prep] | 58 |
|
| 3 | be a [adj] period of | 34 |
|
| 4 | be a [adj] period of | 34 |
|
| 5 | was a [adj] period [prep] | 19 |
|
| 6 | be a [adj] period [prep] | 16 |
|
| 7 | is a [adj] period [prep] | 16 |
|
| 8 | be a [adj] period for | 15 |
|
| 9 | be a [adj] period for | 15 |
|
| 10 | be a [adj] period in | 10 |
|
| 11 | be a [adj] period in | 10 |
|
| 12 | been a [adj] period [prep] | 9 |
|
| 13 | be a long period [prep] | 7 |
|
| 14 | be a long period [prep] | 5 |
|
