| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [prep] a [adj] | 20594 |
|
| 2 | could be [vb pp] [prep] [adj] | 1413 |
|
| 3 | could be [vb pp] [prep] a | 950 |
|
| 4 | could be [vb pp] a [adj] | 36 |
|
| 5 | could be [prep] a [adj] | 20 |
|
