| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [vb pp] over a period [prep] | 41 |
|
| 2 | be [verb] over a period [prep] | 41 |
|
| 3 | [be] [verb] over a period [prep] | 41 |
|
| 4 | [be] [verb] over a period of | 40 |
|
| 5 | be [verb] over a period [prep] | 15 |
|
| 6 | [was/were] [verb] over a period [prep] | 15 |
|
| 7 | [be] [verb] over a period [prep] | 15 |
|
| 8 | was [verb] over a period [prep] | 11 |
|
| 9 | [be] made over a period [prep] | 5 |
|
| 10 | [be] make over a period [prep] | 5 |
|
