| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] be [vb pp] [prep] | 17986 |
|
| 2 | could be [vb pp] [prep] | 7113 |
|
| 3 | [adv] could be [vb pp] | 160 |
|
| 4 | [adv] could be [prep] | 9 |
|
