| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [noun] [modal v] | 14374 |
|
| 2 | a [noun sg] [modal v] | 14212 |
|
| 3 | [art] period [modal v] | 43 |
|
| 4 | [art] period [modal v] | 43 |
|
| 5 | a period [modal v] | 7 |
|
| 6 | a period [modal v] | 7 |
|
