| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [noun sg] [prep] a long period | 10 |
|
| 2 | [verb] [noun] over a long period | 9 |
|
| 3 | [verb] [noun] [prep] a longer period | 7 |
|
| 4 | [verb] [noun] [prep] a long period | 6 |
|
| 5 | [to-vb] [noun] [prep] a long period | 6 |
|
