| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] a [noun] | 9521 |
|
| 2 | [modal v] a [noun] | 763 |
|
| 3 | [modal v] [not/n't] [noun] | 462 |
|
| 4 | [modal v] [not/n't] a | 63 |
|
