| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] [prep] a [adj] period | 182 |
|
| 2 | [be] [vb pp] [prep] a [adj] period | 162 |
|
| 3 | [be] [verb] [prep] a [adj] period | 162 |
|
| 4 | [be] [verb] [prep] a [adj] period | 71 |
|
| 5 | be [verb] [prep] a [adj] period | 71 |
|
| 6 | [be] [verb] for a [adj] period | 61 |
|
| 7 | [be] [verb] over a [adj] period | 52 |
|
| 8 | [be] [verb] [prep] a long period | 37 |
|
| 9 | [was/were] [verb] [prep] a [adj] period | 34 |
|
| 10 | [be] [verb] [prep] a long period | 26 |
|
| 11 | was [verb] [prep] a [adj] period | 25 |
|
| 12 | [been] [verb] [prep] a [adj] period | 25 |
|
| 13 | been [verb] [prep] a [adj] period | 25 |
|
| 14 | is [verb] [prep] a [adj] period | 24 |
|
| 15 | [is] [verb] [prep] a [adj] period | 24 |
|
| 16 | [am/are] [verb] [prep] a [adj] period | 21 |
|
| 17 | are [verb] [prep] a [adj] period | 20 |
|
| 18 | [be] [v-ing] [prep] a [adj] period | 19 |
|
| 19 | [be] [verb] [prep] a [adj -er] period | 19 |
|
| 20 | [be] [verb] [prep] a short period | 18 |
|
| 21 | [be] [verb] through a [adj] period | 13 |
|
| 22 | [be] go [prep] a [adj] period | 13 |
|
| 23 | [be] going [prep] a [adj] period | 13 |
|
| 24 | [be] [verb] [prep] a short period | 13 |
|
| 25 | [be] [verb] within a [adj] period | 13 |
|
| 26 | [be] [verb] [prep] a longer period | 11 |
|
| 27 | [be] [verb] by a [adj] period | 10 |
|
| 28 | [be] [verb] [prep] a limited period | 9 |
|
| 29 | [be] [verb] [prep] a limited period | 9 |
|
| 30 | were [verb] [prep] a [adj] period | 9 |
|
