| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period [prep] time | 283 |
|
| 2 | [prep] a [adj] period of time | 283 |
|
| 3 | [prep] a [adj] period of time | 283 |
|
| 4 | [prep] a [adj] period [prep] time | 268 |
|
| 5 | over a [adj] period [prep] time | 120 |
|
| 6 | for a [adj] period [prep] time | 107 |
|
| 7 | [prep] a long period [prep] time | 98 |
|
| 8 | [prep] a long period [prep] time | 88 |
|
| 9 | [prep] a short period [prep] time | 42 |
|
| 10 | [prep] a short period [prep] time | 38 |
|
| 11 | within a [adj] period [prep] time | 16 |
|
| 12 | [prep] a fixed period [prep] time | 16 |
|
| 13 | [prep] a fixed period [prep] time | 16 |
|
| 14 | [prep] a limited period [prep] time | 15 |
|
| 15 | [prep] a certain period [prep] time | 15 |
|
| 16 | [prep] a certain period [prep] time | 15 |
|
| 17 | in a [adj] period [prep] time | 15 |
|
| 18 | [prep] a [adj -er] period [prep] time | 15 |
|
| 19 | [prep] a limited period [prep] time | 15 |
|
| 20 | [prep] a considerable period [prep] time | 15 |
|
| 21 | [prep] a considerable period [prep] time | 15 |
|
| 22 | [prep] a given period [prep] time | 14 |
|
| 23 | [prep] a given period [prep] time | 14 |
|
| 24 | after a [adj] period [prep] time | 11 |
|
| 25 | [prep] a longer period [prep] time | 10 |
|
| 26 | [prep] a reasonable period [prep] time | 9 |
|
| 27 | [prep] a reasonable period [prep] time | 9 |
|
| 28 | [prep] a prolonged period [prep] time | 9 |
|
| 29 | [prep] a specified period [prep] time | 9 |
|
| 30 | [prep] a specified period [prep] time | 9 |
|
