| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] a [adj] period [prep] time | 28 |
|
| 2 | over [art] [adj] period [prep] time | 19 |
|
| 3 | over [art] [adj] period [prep] time | 19 |
|
| 4 | over a [adj] period [prep] [noun] | 19 |
|
| 5 | over a [adj] period [prep] time | 18 |
|
| 6 | over a [adj] [noun] [prep] time | 17 |
|
| 7 | over a [adj] [noun sg] [prep] time | 17 |
|
| 8 | over a [adj] period [prep] time | 16 |
|
