| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period | 2542 |
|
| 2 | a [adj] period | 2494 |
|
| 3 | a long period | 519 |
|
| 4 | a long period | 405 |
|
| 5 | an [adj] period | 291 |
|
| 6 | a short period | 270 |
|
| 7 | a short period | 242 |
|
| 8 | a [adj -er] period | 230 |
|
| 9 | a longer period | 114 |
|
| 10 | a brief period | 91 |
|
| 11 | a brief period | 90 |
|
| 12 | a limited period | 78 |
|
| 13 | a limited period | 78 |
|
| 14 | a fixed period | 58 |
|
| 15 | a fixed period | 58 |
|
| 16 | a prolonged period | 55 |
|
| 17 | a prolonged period | 55 |
|
| 18 | a certain period | 50 |
|
| 19 | a certain period | 50 |
|
| 20 | a specified period | 49 |
|
| 21 | a specified period | 49 |
|
| 22 | a transitional period | 48 |
|
| 23 | a transitional period | 48 |
|
| 24 | a given period | 46 |
|
| 25 | a extended period | 46 |
|
| 26 | a extended period | 46 |
|
| 27 | a given period | 46 |
|
| 28 | a lengthy period | 43 |
|
| 29 | a lengthy period | 42 |
|
| 30 | a reasonable period | 40 |
|
