| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a period [prep] | 1753 |
|
| 2 | [prep] a period [prep] | 1753 |
|
| 3 | over a period [prep] | 628 |
|
| 4 | over a period [prep] | 628 |
|
| 5 | for a period [prep] | 389 |
|
| 6 | for a period [prep] | 389 |
|
| 7 | [verb] a period [prep] | 346 |
|
| 8 | [be] a period [prep] | 179 |
|
| 9 | be a period [prep] | 179 |
|
| 10 | after a period [prep] | 154 |
|
| 11 | after a period [prep] | 154 |
|
| 12 | in a period [prep] | 126 |
|
| 13 | in a period [prep] | 126 |
|
| 14 | [adv] a period [prep] | 117 |
|
| 15 | [conj] a period [prep] | 89 |
|
| 16 | [was/were] a period [prep] | 89 |
|
| 17 | during a period [prep] | 83 |
|
| 18 | during a period [prep] | 83 |
|
| 19 | [vb past] a period [prep] | 80 |
|
| 20 | was a period [prep] | 75 |
|
| 21 | [adv prt] a period [prep] | 68 |
|
| 22 | over a period [prep] | 62 |
|
| 23 | over a period [prep] | 62 |
|
| 24 | [v-ing] a period [prep] | 61 |
|
| 25 | of a period [prep] | 52 |
|
| 26 | of a period [prep] | 52 |
|
| 27 | [vb -s] a period [prep] | 52 |
|
| 28 | within a period [prep] | 48 |
|
| 29 | through a period [prep] | 48 |
|
| 30 | through a period [prep] | 48 |
|
