| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period [prep] [noun sg] | 122 |
|
| 2 | over a [adj] period of [noun] | 119 |
|
| 3 | over a [adj] period [prep] time | 113 |
|
| 4 | over a [adj] period [prep] time | 113 |
|
| 5 | over a long period [prep] [noun] | 78 |
|
| 6 | over a prolonged period [prep] [noun] | 7 |
|
| 7 | over a short period [prep] [noun] | 7 |
|
| 8 | over a considerable period [prep] [noun] | 7 |
|
| 9 | over a [adj] period [prep] [noun prp] | 6 |
|
| 10 | over a given period [prep] [noun] | 6 |
|
| 11 | over a [adj] period [prep] [noun pl] | 5 |
|
| 12 | over a [adj] period [prep] year | 5 |
|
| 13 | over a [adj] period [prep] years | 5 |
|
