| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] over a [adj] period | 42 |
|
| 2 | [be] [vb pp] over a long period | 14 |
|
| 3 | [be] [vb pp] over a [adj] period | 11 |
|
| 4 | be [vb pp] over a [adj] period | 11 |
|
| 5 | [was/were] [vb pp] over a [adj] period | 9 |
|
| 6 | are [vb pp] over a [adj] period | 8 |
|
| 7 | [am/are] [vb pp] over a [adj] period | 8 |
|
| 8 | been [vb pp] over a [adj] period | 8 |
|
| 9 | [been] [vb pp] over a [adj] period | 8 |
|
| 10 | is [vb pp] over a [adj] period | 5 |
|
| 11 | was [vb pp] over a [adj] period | 5 |
|
| 12 | [be] [vb pp] over a three-year period | 5 |
|
| 13 | [is] [vb pp] over a [adj] period | 5 |
|
