| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for a [adj] period | 590 |
|
| 2 | over a [adj] period | 462 |
|
| 3 | [prep] a long period | 305 |
|
| 4 | [prep] a short period | 178 |
|
| 5 | after a [adj] period | 116 |
|
| 6 | in a [adj] period | 94 |
|
| 7 | within a [adj] period | 93 |
|
| 8 | [prep] a limited period | 66 |
|
| 9 | [prep] a brief period | 60 |
|
| 10 | of a [adj] period | 59 |
|
| 11 | during a [adj] period | 59 |
|
| 12 | [prep] a fixed period | 52 |
|
| 13 | [prep] a specified period | 48 |
|
| 14 | [prep] a given period | 46 |
|
| 15 | [prep] a prolonged period | 42 |
|
| 16 | [prep] a certain period | 42 |
|
| 17 | [prep] a five-year period | 35 |
|
| 18 | [prep] a reasonable period | 34 |
|
| 19 | [prep] a three-year period | 34 |
|
| 20 | [prep] a particular period | 33 |
|
| 21 | through a [adj] period | 31 |
|
| 22 | [prep] a two-year period | 28 |
|
| 23 | [prep] a transitional period | 28 |
|
| 24 | [prep] a considerable period | 28 |
|
| 25 | to a [adj] period | 24 |
|
| 26 | [prep] a lengthy period | 24 |
|
| 27 | with a [adj] period | 22 |
|
| 28 | at a [adj] period | 21 |
|
| 29 | [prep] a continuous period | 19 |
|
| 30 | by a [adj] period | 18 |
|
