| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] be [vb pp] [prep] | 886 |
|
| 2 | could be [vb pp] [prep] [be] | 148 |
|
| 3 | [not/n't] be [vb pp] [prep] [be] | 125 |
|
