| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] a [adj] period | 71 |
|
| 2 | [verb] [adv prt] a [adj] period | 64 |
|
| 3 | [verb] over a [adj] period | 60 |
|
| 4 | [verb] over a [adj] period | 60 |
|
| 5 | [verb] [adv] a long period | 31 |
|
| 6 | [verb] [adv] a long period | 29 |
|
| 7 | [vb past] [adv] a [adj] period | 18 |
|
| 8 | [vb -s] [adv] a [adj] period | 17 |
|
| 9 | [v-ing] [adv] a [adj] period | 11 |
|
| 10 | [vb base] [adv] a [adj] period | 8 |
|
| 11 | [verb] [adv] a [adj] period | 8 |
|
| 12 | [vb infin] [adv] a [adj] period | 7 |
|
| 13 | [to-vb] [adv] a [adj] period | 6 |
|
| 14 | [vb pp] [adv] a [adj] period | 6 |
|
