| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a period [prep] | 1753 |
|
| 2 | [prep] a period of | 1599 |
|
| 3 | [prep] a period of | 1599 |
|
| 4 | over a period [prep] | 628 |
|
| 5 | for a period [prep] | 389 |
|
| 6 | after a period [prep] | 154 |
|
| 7 | in a period [prep] | 126 |
|
| 8 | during a period [prep] | 83 |
|
| 9 | [prep] a period in | 72 |
|
| 10 | [prep] a period in | 72 |
|
| 11 | of a period [prep] | 52 |
|
| 12 | through a period [prep] | 48 |
|
| 13 | within a period [prep] | 48 |
|
| 14 | to a period [prep] | 48 |
|
| 15 | with a period [prep] | 44 |
|
| 16 | by a period [prep] | 37 |
|
| 17 | as a period [prep] | 34 |
|
| 18 | from a period [prep] | 21 |
|
| 19 | [prep] a period after | 13 |
|
| 20 | [prep] a period after | 13 |
|
| 21 | [prep] a period during | 10 |
|
| 22 | on a period [prep] | 10 |
|
| 23 | [prep] a period at | 10 |
|
| 24 | [prep] a period at | 10 |
|
| 25 | [prep] a period during | 10 |
|
| 26 | [prep] a period from | 9 |
|
| 27 | [prep] a period from | 9 |
|
| 28 | into a period [prep] | 8 |
|
| 29 | [prep] a period between | 7 |
|
| 30 | at a period [prep] | 7 |
|
