| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [vb pp] [prep] | 7113 |
|
| 2 | [conj] could be [vb pp] | 1050 |
|
| 3 | [conj] be [vb pp] [prep] | 724 |
|
| 4 | [conj] could be [prep] | 36 |
|
