| 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 [noun] | 39 |
|
| 4 | [adv] over a period of [noun] | 39 |
|
| 5 | [adv] [prep] a period of time | 31 |
|
| 6 | [adv] [prep] a period of time | 31 |
|
| 7 | [adv prt] [prep] a period of [noun] | 28 |
|
| 8 | [adv] [prep] a period of [noun pl] | 17 |
|
| 9 | up [prep] a period of [noun] | 9 |
|
| 10 | up [prep] a period of [noun] | 9 |
|
| 11 | [adv] after a period of [noun] | 9 |
|
| 12 | [adv] [prep] a period of year | 7 |
|
| 13 | [adv] [prep] a period of years | 7 |
|
| 14 | out [prep] a period of [noun] | 5 |
|
| 15 | [adv] [prep] a period of week | 5 |
|
| 16 | [adv] [prep] a period of weeks | 5 |
|
| 17 | out [prep] a period of [noun] | 5 |
|
| 18 | [adv] for a period of [noun] | 5 |
|
