| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | do [adv] drop | 30 |
|
| 2 | [vb base] not drop | 29 |
|
| 3 | [vb base] [not/n't] drop | 29 |
|
| 4 | [vb base] n't drop | 27 |
|
