| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [vb pp] a [noun sg] | 839 |
|
| 2 | could [be] a [noun sg] | 592 |
|
| 3 | could [be] [vb pp] a | 90 |
|
| 4 | could [be] [vb pp] [noun sg] | 69 |
|
