| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [vb pp] [prep] | 7113 |
|
| 2 | it could be [vb pp] | 1259 |
|
| 3 | it be [vb pp] [prep] | 135 |
|
| 4 | it could be [prep] | 94 |
|
