| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] over a [adj] period | 53 |
|
| 2 | be [verb] [prep] a long period | 37 |
|
| 3 | be [verb] [prep] a long period | 37 |
|
| 4 | be [verb] over a long [noun sg] | 25 |
|
| 5 | be [verb] over a long [noun] | 25 |
|
| 6 | [be] [verb] over a long period | 22 |
|
| 7 | be [verb] over [art] long period | 22 |
|
| 8 | be [verb] over a long period | 22 |
|
| 9 | be [verb] over a long period | 22 |
|
