| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [prep] a [adj] | 24780 |
|
| 2 | could be [vb pp] [prep] [adj] | 1413 |
|
| 3 | could be [vb pp] [prep] a | 1140 |
|
| 4 | could be [vb pp] a [adj] | 39 |
|
| 5 | could be [prep] a [adj] | 21 |
|
