| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a period [prep] time | 239 |
|
| 2 | [prep] a period [prep] time | 239 |
|
| 3 | over a period [prep] time | 184 |
|
| 4 | over a period [prep] time | 184 |
|
| 5 | for a period [prep] time | 33 |
|
| 6 | for a period [prep] time | 33 |
|
| 7 | [adv] a period [prep] time | 21 |
|
| 8 | [adv prt] a period [prep] time | 16 |
|
| 9 | over a period [prep] time | 16 |
|
| 10 | over a period [prep] time | 16 |
|
| 11 | after a period [prep] time | 10 |
|
| 12 | after a period [prep] time | 10 |
|
| 13 | [verb] a period [prep] time | 9 |
|
| 14 | such a period [prep] time | 5 |
|
| 15 | [adv] a period [prep] time | 5 |
|
| 16 | [adj] a period [prep] time | 5 |
|
| 17 | [vb base] a period [prep] time | 5 |
|
| 18 | [det] a period [prep] time | 5 |
|
| 19 | such a period [prep] time | 5 |
|
| 20 | a [adj] period [prep] time | 337 |
|
| 21 | a [adj] period [prep] time | 319 |
|
| 22 | a long period [prep] time | 115 |
|
| 23 | a long period [prep] time | 102 |
|
| 24 | a short period [prep] time | 54 |
|
| 25 | a short period [prep] time | 50 |
|
| 26 | a considerable period [prep] time | 20 |
|
| 27 | a considerable period [prep] time | 20 |
|
| 28 | a certain period [prep] time | 19 |
|
| 29 | a certain period [prep] time | 19 |
|
| 30 | a limited period [prep] time | 18 |
|
