| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be for a [noun] | 388 |
|
| 2 | be [prep] a period | 35 |
|
| 3 | be for [art] period | 24 |
|
| 4 | be for [art] period | 24 |
|
| 5 | be for a period | 15 |
|
| 6 | [be] for a period | 15 |
|
