| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] [prep] a period [prep] | 57 |
|
| 2 | be [verb] [prep] a period [prep] | 57 |
|
| 3 | [be] [verb] over a period [prep] | 41 |
|
| 4 | be [verb] over a period [prep] | 41 |
|
| 5 | be [verb] over a [noun] [prep] | 36 |
|
| 6 | be [verb] over [art] period [prep] | 18 |
|
| 7 | be [verb] over [art] period [prep] | 18 |
|
| 8 | be [verb] over a period [prep] | 15 |
|
| 9 | be [verb] over a period [prep] | 15 |
|
| 10 | be [verb] over a period [prep] | 15 |
|
| 11 | [be] [verb] over a period [prep] | 15 |
|
