| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a period of [prep] | 42 |
|
| 2 | a period [prep] [prep] | 42 |
|
| 3 | a period [prep] [prep] | 42 |
|
| 4 | a period of [prep] | 42 |
|
| 5 | a period [verb] [prep] | 37 |
|
| 6 | a period [adv] [prep] | 20 |
|
| 7 | a period [vb pp] [prep] | 19 |
|
| 8 | a period [v-ing] [prep] | 13 |
|
| 9 | a period [adj] [prep] | 12 |
|
| 10 | a period [adj] [prep] | 12 |
|
| 11 | a period [adv] [prep] | 11 |
|
| 12 | a period [noun] [prep] | 8 |
|
| 13 | a period [adv prt] [prep] | 7 |
|
| 14 | a period [noun sg] [prep] | 7 |
|
| 15 | a period [conj] [prep] | 6 |
|
| 16 | a period [coord] [prep] | 5 |
|
| 17 | a period up [prep] | 5 |
|
| 18 | a period up [prep] | 5 |
|
| 19 | a period equal [prep] | 5 |
|
| 20 | a period equal [prep] | 5 |
|
| 21 | [prep] a period [prep] | 1753 |
|
| 22 | [prep] a period [prep] | 1753 |
|
| 23 | over a period [prep] | 628 |
|
| 24 | over a period [prep] | 628 |
|
| 25 | for a period [prep] | 389 |
|
| 26 | for a period [prep] | 389 |
|
| 27 | [verb] a period [prep] | 346 |
|
| 28 | be a period [prep] | 179 |
|
| 29 | [be] a period [prep] | 179 |
|
| 30 | after a period [prep] | 154 |
|
