| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [verb] [prep] a long [noun] | 62 |
|
| 2 | [verb] [verb] [prep] a long period | 18 |
|
| 3 | [vb base] [verb] [prep] a [adj] period | 11 |
|
| 4 | [vb base] [verb] [prep] [art] long period | 5 |
|
| 5 | [vb base] [verb] [prep] a long period | 5 |
|
