| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [not/n't] been slow | 6 |
|
| 2 | has [not/n't] be slow | 6 |
|
| 3 | has [not/n't] [been] slow | 6 |
|
| 4 | has not [be] slow | 6 |
|
