| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] over a [adj] period | 83 |
|
| 2 | [verb] over a [adj] period | 73 |
|
| 3 | [verb] over a long period | 46 |
|
| 4 | [verb] over a long period | 35 |
|
| 5 | [verb] over a [adj -er] period | 13 |
|
| 6 | [verb] over a longer period | 11 |
|
| 7 | develop over a [adj] period | 5 |
|
| 8 | developed over a [adj] period | 5 |
|
| 9 | [verb] over a three-year period | 5 |
|
| 10 | [verb] over a three-year period | 5 |
|
