| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period of time | 123 |
|
| 2 | [prep] a long period of time | 98 |
|
| 3 | [prep] a long period of time | 98 |
|
| 4 | over a long period of [noun] | 81 |
|
| 5 | over a long [noun] of time | 77 |
|
| 6 | over a long period [prep] time | 77 |
|
| 7 | over a long [noun sg] of time | 77 |
|
| 8 | over a long period of time | 77 |
|
| 9 | over [art] long period of time | 77 |
|
| 10 | over a long period of time | 77 |
|
| 11 | over a long period [prep] time | 77 |
|
| 12 | over a long period of time | 77 |
|
