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