| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [not/n't] know | 966 |
|
| 2 | [not/n't] know [det] | 803 |
|
| 3 | [modal v] [not/n't] [det] | 351 |
|
| 4 | [modal v] know [det] | 238 |
|
