| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [prep] a | 15868 |
|
| 2 | [be] [not/n't] [prep] | 11527 |
|
| 3 | [be] [not/n't] a | 10960 |
|
| 4 | [not/n't] [prep] a | 1837 |
|
