| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could be [vb pp] [prep] [adj] | 1413 |
|
| 2 | be [vb pp] [prep] [adj] by | 79 |
|
| 3 | could be [vb pp] [prep] by | 37 |
|
| 4 | could be [vb pp] [adj] by | 15 |
|
