| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period [prep] time | 120 |
|
| 2 | over a long period [prep] time | 77 |
|
| 3 | [prep] a longer period [prep] time | 10 |
|
| 4 | [prep] a longer period [prep] time | 10 |
|
| 5 | over a [adj -er] period [prep] time | 7 |
|
| 6 | over a longer [noun sg] [prep] time | 6 |
|
| 7 | over [art] longer period [prep] time | 6 |
|
| 8 | over a longer period [prep] time | 6 |
|
| 9 | over [art] longer period [prep] time | 6 |
|
| 10 | over a longer [noun] [prep] time | 6 |
|
| 11 | over a longer period [prep] time | 6 |
|
| 12 | over a longer period [prep] time | 6 |
|
| 13 | over a longer period [prep] time | 6 |
|
| 14 | over a longer period [prep] [noun] | 6 |
|
