| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] over a period of [noun] | 15 |
|
| 2 | [conj] over a period of time | 14 |
|
| 3 | [coord] [prep] a period of time | 13 |
|
| 4 | [coord] [prep] a period of time | 13 |
|
| 5 | [coord] over a [noun sg] of time | 11 |
|
| 6 | [coord] over a [noun] of time | 11 |
|
| 7 | [coord] over a period [prep] time | 11 |
|
| 8 | [coord] over a period of time | 11 |
|
| 9 | [coord] over [art] period of time | 11 |
|
| 10 | [coord] over a period of time | 11 |
|
