| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] a [noun] | 116970 |
|
| 2 | [be] a [noun sg] | 113406 |
|
| 3 | [be] [art] period | 316 |
|
| 4 | [be] [art] period | 316 |
|
| 5 | [be] a period | 232 |
|
| 6 | [be] a period | 232 |
|
