| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [adv] a | 5614 |
|
| 2 | it [be] n't [adv] | 1623 |
|
| 3 | it [be] n't a | 623 |
|
| 4 | [be] n't [adv] a | 307 |
|
