| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] [prep] a long period | 37 |
|
| 2 | [be] [verb] [prep] a long period | 37 |
|
| 3 | is [verb] [prep] a [adj] period | 24 |
|
| 4 | is [verb] [prep] a long [noun] | 22 |
|
| 5 | is [verb] [prep] a long [noun sg] | 22 |
|
| 6 | is [verb] [prep] a long period | 5 |
|
| 7 | [is] [verb] [prep] a long period | 5 |
|
| 8 | is [verb] [prep] a long period | 5 |
|
| 9 | is [verb] [prep] [art] long period | 5 |
|
| 10 | is [verb] [prep] a long period | 5 |
|
| 11 | is [verb] [prep] [art] long period | 5 |
|
