| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] a period of [noun] | 68 |
|
| 2 | [adv] [prep] a period of [noun sg] | 51 |
|
| 3 | [adv] [prep] a period of [adj] | 47 |
|
| 4 | [adv] [prep] a period of time | 31 |
|
| 5 | [adv] [prep] a period of time | 31 |
|
| 6 | [adv] [prep] a period of [num] | 28 |
|
| 7 | [adv] [prep] a period of [noun pl] | 17 |
|
| 8 | [adv] [prep] a period of [adj] | 15 |
|
| 9 | [adv] [prep] a period of years | 7 |
|
| 10 | [adv] [prep] a period of year | 7 |
|
| 11 | [adv] [prep] a period of four | 5 |
|
| 12 | [adv] [prep] a period of weeks | 5 |
|
| 13 | [adv] [prep] a period of four | 5 |
|
| 14 | [adv] [prep] a period of week | 5 |
|
| 15 | [verb] [adv] [prep] a period of | 61 |
|
| 16 | [vb pp] [adv] [prep] a period of | 31 |
|
| 17 | [noun] [adv] [prep] a period of | 14 |
|
| 18 | [noun sg] [adv] [prep] a period of | 10 |
|
| 19 | [conj] [adv] [prep] a period of | 10 |
|
| 20 | [adv] [adv] [prep] a period of | 10 |
|
| 21 | [coord] [adv] [prep] a period of | 9 |
|
| 22 | [vb past] [adv] [prep] a period of | 8 |
|
| 23 | [be] [adv] [prep] a period of | 6 |
|
| 24 | be [adv] [prep] a period of | 6 |
|
| 25 | [adv] [adv] [prep] a period of | 6 |
|
| 26 | [to-vb] [adv] [prep] a period of | 5 |
|
| 27 | and [adv] [prep] a period of | 5 |
|
| 28 | and [adv] [prep] a period of | 5 |
|
| 29 | [vb -s] [adv] [prep] a period of | 5 |
|
| 30 | [v-ing] [adv] [prep] a period of | 5 |
|
