| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be a [noun] | 116941 |
|
| 2 | be a [noun sg] | 113377 |
|
| 3 | be [art] period | 316 |
|
| 4 | be [art] period | 316 |
|
| 5 | be a period | 232 |
|
| 6 | [be] a period | 232 |
|
| 7 | be a period | 232 |
|
