| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [not/n't] a | 7640 |
|
| 2 | [is] usually a | 318 |
|
| 3 | [is] [not/n't] usually | 149 |
|
| 4 | [not/n't] usually a | 32 |
|
